■ -nm./-:. v>a.ta 



THOMSON RECORDING 
WATTMETERS 



GENERAL ELECTRIC CO. 
SCHENECTADY, N. Y, 




GojpglitN? 



COPYRIGHT DEPOSIT. 



THE LIBRARY OF 
CONGRESS, 

Two Copies Receiver 

OCT 17 '903 

Copyright Entry 

0-tAr /*)-!% 02 

CLASS Cts XXc, No 

*) o to *+ 3 

COPY B. 



Copyrighted iqoj 
by 

General Electric Company 



GENERAL DATA 

ON 

THOMSON RECORDING 
WATTMETERS 



GENERAL ELECTRIC CO., 

SCHENECTADY, N. Y. 

AUGUST, 1903 NO. 3J97 



<H 



U 



X 



Q^ 




THOMSON RECORDING WATTMETER, FORM J-2 
FRONT CONNECTED, NO, 3 FINISH 

C Without Cover) 




THOMSON RECORDING WATTMETER, FORM D-2 

FRONT CONNECTED, NO, 3 FINISH 

C Without Cover) 




THOMSON RECORDING WATTMETER, FORM D-2 

BACK CONNECTED, NO. 5 FINISH 

{With Cover) 




THOMSON RECORDING WATTMETER, FORM GC-4 
ASTATIC TYPE, NO, 5 FINISH 

{With Cover) 




THOMSON RECORDING WATTMETER, RAILWAY OR STREET 
CAR TYPE, FRONT CONNECTED, STANDARD FINISH 

{With Cover) 




THOMSON RECORDING WATTMETER, RAILWAY OR STREET 

CAR TYPE, FRONT CONNECTED, STANDARD FINISH 

{Without Cover) 




THOMSON RECORDING ARC WATTMETER 
CEILING BOARD TYPE, NO. 3 FINISH 

( Without Cover) 




THOMSON RECORDING ARC WATTMETER 

STATION TYPE, FRONT CONNECTED, STANDARD FINISH 

( Without Cover) 




CLOCK MECHANISM FOR SINGLE DIAL, TWO RATE 
THOMSON RECORDING WATTMETER 

( Without Cover) 



10 




THOMSON RECORDING WATTMETER 
PREPAYMENT DEVICE 

(Without Cover) 



11 




THOMSON HIGH TORQUE INDUCTION METER 

SINGLE-PHASE, FRONT CONNECTED, NO, 3 FINISH 

{With Cover) 




THOMSON HIGH TORQUE INDUCTION METER INTERIOR 
SINGLE-PHASE, FRONT CONNECTED, NO, 3 FINISH 

( Without Cover) 



13 




THOMSON POLYPHASE METER 
RECTANGULAR PATTERN, FRONT CONNECTED, NO. 3 FINISH 

{With Cover) 



14 




THOMSON POLYPHASE METER 
RECTANGULAR PATTERN, FRONT CONNECTED, NO. 3 FINISH 

( Without Cover) 



15 




THOMSON ROUND PATTERN SINGLE-PHASE INDUCTION METER 
BACK CONNECTED, NO, 5 FINISH 

{With Cover) 



16 




THOMSON ROUND PATTERN POLYPHASE METER 

BACK CONNECTED, NO, 5 FINISH 

{With Cover) 



THOMSON RECORDING WATTMETERS 

The information and instructions, given in this book, are general in character 
and are subject to change by any special information or instructions which may 
accompany meters, when shipped. 

PREFACE 

The first meter Instruction Book, 8050, gave data relating to the Form J, the 
Form F and the Form D Thomson Recording Wattmeters. Since that issue 
many changes and improvements have been made. 

The Form F meter was replaced by the Form D, thus making all capacities 
from 25 to 600 amperes of the same dimensions. 

Much time and care was also spent in redesign, the results of which were 
embodied in the Forms J-l and D-l meters. These were dust-proof and supplied 
with an adjustable shunt field coil, thus providing for necessary light load 
adjustment at the time and place of installation. 

Still later modifications have resulted in discarding the old form of register 
requiring the use of a dial constant and the substitution of a direct reading 
register. 

The holder for the adjustable shunt coil has been simplified so that it may be 
used on meters of from 3 to 600 amperes capacity. 

The electrical qualities have also been greatly improved and with these new 
features added, the meters are now known as the Forms T-2 and D-2. 

For measuring the total output on direct current switchboards, meters are 
designed ranging in capacity from 800 to 10,000 amperes. These are provided 
with two adjustable shunt field coils. 

In addition to the data given on Thomson Recording Wattmeters, sections 
have been added giving information in regard to Thomson Single-phase Induction, 
High Torque Induction and Thomson Polyphase Meters. 

A word of explanation may not be amiss in regard to the significance of form 
letters used in this book. 

J— Standard meter for currents of 3-15 amperes inclusive, low efficiency. 

D— Standard meter for currents of 15-600 amperes inclusive, low efficiency. 

F — Old form superseded by " D." 

E — Meter with extended base for cage resistance. 

EE— Meter with extended base for resistance (1200 amperes only). 

E and EE — Are now superseded by the " D " forms. 

N — Used with other letters to indicate high efficiency meters. 

(G)— Used with figs. 1, 2, 3, 4, etc., to indicate High Capacity Meter. 

(C4)— Thomson Single-phase House Type Induction Meter, direct reading 
register. (Superseded by High Torque). 

Figures 1 and 2 are used with form letters " J " and " D ". Figure No. 1 indi- 
cates dust-proof meter with adjustable shunt, brown shellaced fields, non- 
direct reading register and copper disk. Figure 2 indicates dust-proof meter 
with adjustable shunt, black taped fields, direct reading register and aluminum 
disk. 

18 



Form "J-2" meters are those of small capacity, ranging from 3 to 15 
amperes front connected and 3 to 10 amperes back connected. The Form " D-2 " 
includes meters of larger capacity than those mentioned; up to and including 
1200 amperes. 

In quality and construction both forms are identical, differing only in 
general dimensions. 

COVERS AND FINISH 

Thomson Recording Wattmeters are furnished with several different finishes, 
brief descriptions of which are given below : 

Xo. 1 Finish. — No. 1 cover, glass front, sides and top. The metal parts of 
cover are brass, buffed and lacquered. All brass parts of the meter are buffed on 
surfaces showing after assembling. The disk is polished and lacquered. 

Xo. 2 Finish. — Xo. 2 cover, glass front, metal sides and top. The metal 
parts of the cover are buffed and nickel-plated. The meter frame, brush bracket, 
etc.. are buffed and nickel-plated. The disk is polished and lacquered. 

Xo. 3 Finish.— Xo. 3 cover, sheet metal, no glass except in front of 
dial. Cover, black japan. The metal parts of the meter are dipped and 
lacquered. Window in cover for observation of disk when so ordered. 

Xo. 4 Finish.— No. 2 cover, glass front, metal sides and top. Metal parts 
of cover are black oxide. Meter frame, brush bracket, etc., are black oxide: the 
disk is polished and lacquered. The base is polished black japan. This finish is 
known as "Black Oxide." 

Xo. 5 Finish.— Xo. 2 cover, glass front, metal sides and top. Metal parts 
of cover are dull black. Meter frame, brush bracket, etc., are dull black; the 
disk is polished and lacquered. The base is polished black japan. This finish is 
known as " Dull Black." 

Either a No. 1 or No. 2 cover may be used with any special finish. Orders 
should plainly state any change desired, otherwise standard finished meters will be 
furnished as above outlined. 

G-2 Meters.— Form G Cover, metal frame with glass top and bottom, sides and 
front. The metal parts of the cover are No. 5 (dull black) finish; the fields, 
polished copper: studs supporting magnetic shield, polished brass: the shield, 
black enamel with edge of upper plate polished copper. This meter is now 
superseded by Form GG-4, having the same finish. 

Arc Meters.— The standard finish is dull black (on No. 3 cover) with internal 
parts dipped and lacquered. 

The standard finish of Thomson Recording Wattmeters, for secondary 
circuits up to and including 600 amperes capacity, is No. 3. (Black Japan.) 

The standard finish of switchboard and primary meters is No. 5. (Dull 
Black.) 

Xo. 3 finish meters will be furnished front connected unless the order states 
that back connections are desired. 

No. 1, Xo. 2, Xo. 4 or Xo. 5 finish meters will be furnished back connected 
unless the order states that front connections are desired. 

19 



TR WATTMETER COVERS 





NO. \ COVER 



NO. 2 COVER 





<? 



NO. 3 COVER 



FORM G COVER 



20 



In brief, unless stated to the contrary, orders will be rilled as follows : 
Secondary — for house installation . . Xo. 3 (japan) 
Secondary — for switchboard use . . Xo. 5 (dull black) 

Primary Xo. 5 (dull black) 

Station arc Xo. 3 cover (dull black) 

If special finishes are ordered without stating the style of cover, they will be 
interpreted as follows : 

Brass Xo. 1 cover 

Copper Xo. 1 cover 

Xickel Xo. 2 cover 

Black Oxide . Xo. 2 cover 

Dull Black Xo. 2 cover 

THOMSON SINGLE-PHASE INDUCTION METERS, front connected 
for house installation, have cast metal cover. The cover and base are finished in 
black japan. 

Back connected for switchboard installation have cylindrical glass covers 
with cast metal frames. The base is finished in black japan, while the metal 
parts of cover and interior of the meter have Xo. 5 (dull black) finish. 

THOMSON POLYPHASE METERS, front connected for house installa- 
tion, have sheet metal cover finished in black japan ; the base and interior parts 
of the meter are dipped and lacquered. 

Back connected for switchboard installation have cylindrical glass cover with 
cast metal frame. The base is finished in black japan, while the metal parts of 
cover and interior of the meter are Xo. 5 (dull black). 

RAILWAY METER.— Cover, all metal with dull black finish; base and 
interior parts of the meter, black japan. 

TWO RATE.— The finish of the meter is the same as the front connected 
Thomson Recording Wattmeter for house installation. 

The case containing clock mechanism is finished in black japan. 
PREPAYMENT.— The finish of the meter is the same as described for 2-rate. 
The case containing the prepayment device is finished in black japan with 
aluminum coin receptacle. 

INTERPRETATION OF ORDERS AND GENERAL 
REMARKS 

Give capacity of meter in amperes and volts in addition to catalogue number 
to avoid possible error in ordering. 

When orders for meters specify capacity in amperes, volts and horse-power, 
meters will be shipped according to the specified volts and amperes. 

Front connected meters, which are built normally with extension bases at the 
back of the meter for the resistance cage. will, when specially finished, be built 
without the extension, the separate resistance being placed behind the switchboard. 

Xo. 3 finish meters can be furnished with a small window in the cover for 
observing the rotation of the disk. 

21 



Orders for primary meters must state the voltage and frequency of circuit so 
that suitable transformers may be furnished. 

Orders for prepayment meters must give rate per kilowatt-hour, and, if for 
use on alternating current, the frequency of circuit. 

Orders for 2-rate meters must give high and low rate per kilowatt -hour, and, 
if for use on alternating current, the frequency of circuit. 

Orders for single-phase induction meters must give frequency of circuit. 

Orders for polyphase meters must give frequency of circuit and the number 
of phases and wires of system on which they are to be used. 

Orders for arc meters should state capacity in amperes and volts and not in 
lamps. 

Pointer registers will be furnished with all Single and Polyphase Induction 
Meters and Thomson Recording Wattmeters. Cyclometer dials can be furnished 
on the latter if so ordered, but are not standard and have fractional constants. 

The standard current transformers for operating meters have 5 amp. 
maximum and 3 amp. continuous secondaries. 

The standard transformer for supplying potential to the armature circuit of 
Primary Thomson Recording Wattmeters has a capacity of 10 watts ; for Primary 
Single-phase and Polyphase Induction Meters, 50 watts. 

When additional load is to be used on potential transformers operating meters, 
it should be so stated on order. 

INSTRUCTIONS FOR ATTACHING SEPARATE ADJUST- 
ABLE SHUNT FIELD COILS TO THOMSON 
RECORDING WATTMETERS 

To place adjustable shunt field coils in meters already installed, remove the 
stationary coil and disconnect it from the circuit. In this operation, care must be 
taken not to injure the insulation of either the field winding or the armature. 
Remove the resistance enclosed in an envelope inside of the meter or mounted in 
a resistance box. The resistance is wound in sections of iron and German silver 
wire, or is composed entirely of copper. Part of this wire is to be removed. The 
iron wire may be detected by the use of a magnet passed over the coils. Remove 
all of the German silver wire from the resistance card, place the card in its new 
envelope, first completing the connections of the reduced resistance to its two 
terminal wires and reinsert the resistance card into the meter, but do not seal the 
envelope. If the resistance is wound on tubes, they should be taken from the 
box and a part of the wire removed, after which the connections must be made as 
noted above. 

For convenience in packing and installing, the adjustable shunt field coil is 
not assembled when shipped. To install it in the meter, proceed as follows : 
Insert the arm (D) into the field coils as shown in the illustration on page 23, at 
the same time holding the clamp (C) between the field coils so that the arm (D) 
will slip through the opening in (C). Turn up the wing-nut (B) sufficiently to 
hold (D) in place. Loosen the knurled thumb-nut (A) on the adjustable coil and 
slip the slotted end of (U) beneath the thumb-nut. Before tightening the nut, 

33 



the coil should be centered with respect to the armature by moving it up or down 
until in the desired position. Loosen the wing-nut (B) and slide the shunt field 
coil until fairly within the field coil of the meter, when this nut should be tightened. 

In order to prevent the arm (D) from adhering to the field coils, having 
shellaced surfaces, a narrow strip of heavy paper should be placed between the 
sliding bar and the meter coils. 

The diagrams of connections given on page 24 may be followed for all 
meters to which they apply. For other forms the coil should be placed in the same 
field from which the old one is removed and the same connections must be made. 




ADJUSTABLE, SHUNT FIELD COIL 

The proper lead must be attached to the brush, otherwise the current in the 
coil will not flow in the same direction as that of the field. The following table 
gives the color of the leads to be attached to the brush for different types of meters. 

*3 TO 600 AMPERES 



Type of Meter 


Position of Coil 


Color of Brush Lead 


2-wire 


Left-field 


Black 


2- wire 


Right-field 


Yellow 


t3-wire 


Right-field 


Black 


t3-wire 


Left-field 


Black 


Balanced 3-phase 


Left-field 


Black 


Balanced 3-phase 


Right-field 


Yellow 



*1200 ampere meters require a combination of two coils; an adjustable one 
being placed in the left field and a stationary in the right. 

t Three-wire cross connected meters having a capacity of 3£ to 25 amperes 
must have a specially mounted adjustable coil owing to the fact that the connection 
between the current coils is made in front. 

23 



p* 



00 

O 
U 

3 

W 
b 



s- 



s 

< 

h 

CO 

D 

»-> 

P 
< 

O 

CO 

i 

h 

u 
w 

i 

o 

u 




If shunt held coils are desired for either of these classes of meters, it must be 
so stated on order. 

After connections have been made, the meter should be tested to prove the 
accuracy of the work. If improperly connected, the meter will run slower, on 
light loads when the coil is in place, instead of faster. A reversal of the leads will 
correct the error. 

The meter should now be tested for full load. If it runs within 5% of normal 
with the magnets in their original position, sufficient wire has been removed. If 
the meter runs more than 5% slow, remove still more of the wire from the 
resistance. The whole purpose is to bring the total resistance of the armature 
circuit to approximately its original value. Having done this, make the electrical 
connections permanent, and if an internal resistance, seal the envelope. Great 
care must be exercised to make good electrical joints in the connections. Only 
resin, dissolved in alcohol, should be used in soldering. 

Having completed the new armature circuit in a permanent manner, recalibrate 
the meter to normal full load accuracy by adjusting the permanent magnets. 

Light load accuracy can be obtained by loosening the wing-nut (B) and 
moving the adjustable coil toward or away from the armature ; moving the coil 
toward the armature increases the meter speed, and moving it away diminishes 
the speed. 

When the meter has been properly adjusted, the nuts holding the coil in place 
should be set securely. 

Note:— When placing orders for adjustable shunt field coils, it is well to 
order new resistance envelopes, as the old ones are liable to be damaged when 
resealing. 

Below is given a table of envelope dimensions, together with the form num- 
ber which should be used when ordering. 



Width 


Length 


Form No. 


n» 


«4" 


1 


3|" 


4J" 


2 


sr 


5i" 


3 


*r 


5T 


4 



LIGHT LOAD ADJUSTMENT FOR THOMSON 

SINGLE-PHASE AND HIGH TORQUE 

INDUCTION METERS 

The induction meter is provided with a light load adjustment which can be 
adjusted to correct for variations in local conditions. The device consists of a 
movable sector located between the poles of an electro-magnet. 

Standing so that the device is brought directly between the observer and the 
shaft of the meter, moving the sector toward the right increases the speed at 
light loads : moving it toward the left causes the meter to run more slowly at light 

2.5 



loads and also tends to prevent creeping. If the sector is moved too far so as to 
pass beyond the field of the electro-magnet, its effect will be correspondingly 
diminished. The movement affects only the light load accuracy of the meter 
and has no effect upon the full load ; therefore, it is not necessary to recalibrate 
the meter after making the adjustment. 

NON-CREEPING DEVICE FOR SINGLE-PHASE 
INDUCTION AND POLYPHASE METERS 

Owing to the lightness of the moving element of these meters, there may be 
a tendency under certain conditions for the disk to creep on no load, even when 
the light load adjustment is properly set. To counteract this, an iron wire is 
fastened to the disk adjacent to the hub. This wire should not be moved unless 
it is found that creeping exists. The wire should then be slightly inclined radially 
away from the shaft. Care must be exercised in doing this, as too much of a 
movement will prevent the meter starting at sufficiently light load. Moving the 
wire toward the shaft will tend to make the meter run faster on light load. On 
HIGH TORQUE METERS this iron wire is placed around the hub parallel 
with the disk and may be bent to or from the shaft. 

The adjustment when properly made will not in any way interfere with the 
running of the meter, but will absolutely prevent creeping on no-load. 

JEWELS AND PIVOTS 

If a new jewel be inserted in a meter, it is advisable to put in a new pivot, as 
the old one will probably be injured, particularly if the meter has been running 
with a damaged jewel. 

Before inserting the new jewel it is well to place a drop of fine watch oil in 
the cup. 

When inserting a new jewel it may be found necessary to raise or lower the 
moving element of the meter. To do this, insert the jewel screw and turn until it 
clamps tightly against the bushing. Loosen the hexagonal brass check-nut under 
the meter disk. The desired adjustment can then be made by turning the jewel 
screw up or down, the bushing referred to moving with it. When the proper point 
has been reached, the check-nut must be carefully tightened. On all meters 
now shipped the check-nut is located beneath the meter base, as shown in the 
accompanying illustration on page 27. 

To insert a new pivot, loosen the jewel screw until the disk rests upon the 
magnets where it should be firmly wedged. Then remove the jewel screw entirely 
from the meter and insert the pivot wrench in its place. Press firmly, thus clamping 
the pivot in the end of the wrench and unscrew. Replace the pivot by a new one 
and screw into the shaft. Remove the wedges from the disk and insert the jewel 
screw. 

Care must be exercised in this operation that the adjustment of the brushes 
of Thomson Recording Wattmeters is not altered and that neither the shaft nor 
disk is sprung. 

Extensive experiments have determined that the life of the jewel depends 
upon the relation of the natural period of the jewel spring to the weight of the 

36 



moving element. To obtain the best jewel life, it necessitates construction having 
a spring strength suitable to the weight under which it is to operate. Owing to 
the decrease in the weight of the moving element of the later form of Thomson 
Recording Wattmeters, we will furnish jewels having a different spring strength 
from that used in meters having copper disks. As the weight of the moving 
element varies in the different types of meters, we are prepared to furnish jewels 
for each type. There are four classes for use with the following meters : 




H 



\F=*\ 



" Single " disk aluminum, " Single " disk copper, " Double ,? disk aluminum and 
"Double" disk copper. All " Sapphire " jewels, with exception of Catalogue 
No. 6704, are mounted in fillister head screws, the " Diamond " having hexagonal 
heads. Jewels of different spring strengths are classified by finishes as given below : 
For meters with " Single " aluminum disk . . . Nickel 
" copper " ... Brass 

<l " Double " aluminum disk . . . Oxide 
" copper " . . . Copper 

27 



T.R.W. meters of the commutator type in capacities given below are fur- 
nished with diamond in place of sapphire jewels : 



Voltage 



Ampere Capacity 



110 


600 and abo 


220 


300 " 


550 


100 " 


1100 


50 " 


2200 


25 " 


3300 


15 " 


5500 


10 " 


6600 


10 " 



Above 0600 volts, all capacities. 

INSTALLING 

The meter should be transported from the station to the customer's premises 
in such a manner that it cannot be injured. It is advisable not only to lower the 
jewel from the pivot, but also to carefully wedge the disk between the magnet 
jaws or otherwise support the moving element. Where transportation is by hand, 
this latter precaution is unnecessary. 

In selecting a location for the meter, it is far more important to be guided by 
the requirements of the meter than to place it at the point where the service 
wires enter the building. The meter should be installed where it is readily acces- 
sible for reading or testing and the location clean, dry and free from vibration, 
dust, moisture, etc., all of which tend to cause a meter to under-record on light 
loads. Wooden partitions should be avoided, particularly if they have doors 
which are liable to be violently closed and thus damage the jewel, or in the 
commutator type cause sparking at the brushes. Structures which are liable to 
form a sounding board and magnify any slight hum given out by the meter should 
be avoided whenever possible. 

The jewel should not be screwed into place until the meter has been connected 
and all hammering or other similar work completed. It is also advisable to note 
that the meter operates satisfactorily with but one lamp burning before sealing 
the cover. 

Instruction books giving complete diagrams of connections are included in 
each shipment of meters and should be carefully read before installing. 

COMMUTATORS AND BRUSHES 

Commutators and brushes when shipped from the factory are untarnished 
and carefully adjusted. The first care should be to inspect the adjustment of the 
brushes to see that it has not altered in transportation. The brushes should rest 
evenly and uniformly on the commutator and both fingers have the same tension. 
If this tension is too light, sparking is liable to occur, particularly if the meter is 



28 



installed in a location subject to considerable vibration ; if too heavy, it introduces 
excessive friction errors and causes under-registration on light loads. Either 
extreme condition is liable to roughen up the commutator and should be avoided. 

The tension may be estimated by carefully pressing back the brush about g" 
from the commutator and, when released, noting that it does not rebound after 
striking. 

Another method is to press back one-half of the brush and note that the 
second half leaves the commutator when the first has traveled about §". 

The brush tension should be made suitable for the point of installation and 
not changed. The light load accuracy should not be attained by means of brush 
adjustment but by following instructions given below covering light load 
adjustments. 

No lubricant of any kind should be used on the commutator, as it is liable to 
. get between the segments and cause variable speed and unsatisfactory operation. 

LIGHT LOAD ADJUSTMENT 

The light load accuracy of a meter is of the greatest importance and both the 
commutating and induction type meters are provided with an adjustable light 
load compensation, by means of which the light load accuracy may be corrected 
without materially affecting the operation of the meter at any other load. 

Under no circumstances should the light load accuracy of a commutating 
meter be controlled by altering the friction component of the brushes and com- 
mutator as the brush adjustment once made for a certain location should not be 
altered. 

After the meter has been in service for a couple of months it will show a ten- 
dency to run slow on light loads, due to the tarnished condition of the commu- 
tator. It should then be corrected not by cleaning the commutator or brushes, 
which are now in their normal and constant condition, but by moving the 
adjustable shunt nearer the armature. After this correction, further deterioration 
at the commutator is not to be anticipated. See page 22, adjustable shunts. 

A distinction must be made between a tarnished commutator, which is con- 
stant and does not spark, and a rough commutator which has been caused by 
sparking and which continues to spark and is not in a constant condition. The 
former is constant and should not be altered ; the latter should be smoothed up 
by tape but not brightened and the brushes readjusted to give sparkless operation, 
after which the necessity of further change is extremely improbable. 

JEWEL AND PIVOT 

Only two materials have been found suitable for meter jewels — selected 
Eastern sapphire and diamond. Sapphire jewels are invariably cupped and when 
suitably selected for the conditions of use, will give long and satisfactory opera- 
tion. Diamond jewels are flat, since it is impossible to cup and polish the stone 
in a satisfactory manner, consequently a ring-stone of sapphire is necessary in 
order to keep the meter pivot in the center of the diamond. These jewels are 
almost indestructible and should be used in those meters which have heavy mov- 
ing elements or which are subject to considerable vibration. Their use is recom- 



mended for meters of considerable capacity, where the additional expense of 
such diamond jewel is insignificant as compared to the increased light load 
revenue. 

It is sometimes noticed that the speed of a meter upon a diamond jewel is 
slightly erratic on the lighter loads. This is due to the pivot being occasionally 
in contact with the ring-stone causing additional friction, but notwithstanding 
this apparent slowness at times, the light load revenue from the meter is materially 
increased by the use of this diamond. 

Extensive experiments have established a very definite relation between the 
natural period of the spring on which the jewel is mounted as compared to the 
weight of the moving element and the life of the jewel. In order to take advan- 
tage of this relation, the meters are divided into classes and the spring best 
adapted to each class carefully determined. See page 26, jewels and pivots. 

By selecting the spring best adapted to the meter and conditions of use, the 
life of the jewel may be greatly prolonged and the light load revenue materially 
increased. See page 27. 

Pivots are made of the highest grade of piano wire, which is drawn under 
such an enormous pressure that the finest grain is obtained. These wires are 
hardened glass hard and highly polished, still when they have been operating for 
any length of time upon a broken or rough jewel, this highly polished surface is 
broken, probably charged with small particles of sapphire and the pivot becomes 
a cutting tool. For this reason, a new pivot should always be inserted when the 
jewel has been replaced. 

Sapphire jewels which are only slightly roughened may sometimes be returned 
to the factory and repolished if the damage does not extend too far from the sur- 
face. When possible the stone is cut away and the jewel recupped and repolished, 
but very often the damaged material extends to such a depth that the recupped 
jewel would not be thick enough to be relied upon. Jewels under these condi- 
tions should be thrown away. 

Under no circumstances should jewels be repolished without removing entirely 
from the setting, as the diamond powder used in repolishing gets under the brass 
rim, which is spun over the jewel and this powder is very difficult to remove. 

When installed in a meter, the oil used in the jewel cup carries down a few of 
these minute particles and in connection with the pivot forms a cutting tool and 
soon wears out both pivot and jewel. 

Since the end of the pivot which has been running on a broken or rough jewel 
is liable to be charged with small particles of sapphire, which cannot be readily 
removed, pivots should never be repolished. 

CREEPING— COMMUTATING METER 

Commutating meters which have a tendency to creep may be corrected by fas- 
tening a small U-shaped piece of iron on the edge of the disk. This will exert a 
momentary restraining force when it is opposite one of the magnets and is suffi- 
cient to prevent creeping on potential alone. Such a device is readily constructed 
by closing a small piece of approximately .035" (diameter) iron wire on itself and 
slipping it over the edge of the disk. 

30 



An adjustment of the effect may be made by sliding the wire to and from the 
edge of the disk thus approaching or receding from the magnet poie. The iron 
should be as near the edge of the disk as possible consistent with no rotation on 
potential alone. 

The adjustment of the iron should be made with great care, as a sluggish 
action of the disk will lower the accuracy of the meter on light loads. After 
making a sensitive adjustment sufficient to prevent creeping, the meter can be 
adjusted for light load accuracy by moving the adjustable shunt. Many methods 
used heretofore to prevent creeping have affected the light load accuracy, but by 
the use of iron clips as described above, this feature is entirely eliminated. 

INDUCTION METERS 

The iron clip must never be used on meters of the induction type owing to the 
fact that it would give trouble at the light load adjustment. 

Instructions for the correction of creeping of induction meters are given on 
page 26. 

GENERAL NOTES 

Meters equipped with direct reading registers have a calibrating constant 
which is used in testing only and must not be used in calculating customer's bills. 

This constant will be found marked on the terminal boards or meter disk and 
takes into consideration the reduction in the gear train to the first dial pointer. 

In the older types of meters which were not equipped with direct reading regis- 
ters, the calibrating or testing constant and that marked on the dial face were 
identical. 

It will be noticed that meters of the commutating type have their terminals 
marked (+) and (— ) and to secure the best results should be so connected. If 
connected in the reverse order a slight light load error will be noticed on direct 
current caused by projected fields from the magnets. 

In using commutating meters on alternating circuits having inductive loads, 
lagged meters should be used if the power factor is liable to bs lower than .7, but 
for higher power factors, the lagging is unnecessary. These lagged meters are 
standard in every respect, with exception of a non-inductive resistance connected 
in multiple with the field coils thus lagging the field current until it is in phase 
with the armature current at non-inductive load. This compensation is inde- 
pendent of frequency or load variations. 

In connecting meters in polyphase circuits, great care should be used to see 
that the potential circuits of the meters are in the proper phase for if connected 
to the opposite phase the registration will be incorrect. 

In case it becomes necessary to bring the leads from the line or generator to 
the right-hand binding post, in place of the left, the meter will run in reverse direc- 
tion. This may be corrected by connecting the brush resistance lead to the oppo- 
site connection clip and reversing the position of the shunt field leads. To reverse 
these connections, the lead connected to the binding post should be attached to the 
remaining brush connection clip, and the lead originally connected to the brush 
connection clip should be secured to the binding post. 

31 



This method of. connection should always be followed in preference to revers- 
ing the entire potential circuit at the binding post, otherwise, full difference of 
potential will be placed between the field and shunt. 

Oil should never be used in the top bearing of a commutating meter as it is 
liable to run down and get between the commutator segments. If the registering 
movement is oiled it must be carefully wiped afterward so that no oil may drop 
from it. 

If, when using single-phase induction meters, it becomes necessary to bring 
the leads from the line to the right-hand binding post in place of the left the 
meter will run slow on light loads. This may be corrected by reversing the leads 
connected to the light load adjusting coil. 

When using single-phase meters on polyphase circuits care must be taken to 
connect the potential circuits in the proper phase to insure correct registration. 

If a polyphase meter should run sometimes in one direction and sometimes 
in another, it is an indication that the potential circuits are connected across 
the wrong phases. 

CHECKING AND TESTING 

All Electric Light and Power Companies should be equipped for testing their 
meters. The benefit derived from the careful handling of a meter system will 
warrant the necessary expenditure to obtain the simple equipment which is 
required. 

It is important that a suitable location be selected to establish a Testing 
Department, and the place selected be as dry and free from vibration as possible. 
As meters are expected to operate under varying conditions when installed, this 
may be taken into consideration when selecting a location for a testing bench and 
an effort may be made to establish conditions as near as possible to those under 
which the meters are expected to operate. 

A testing rack is necessary for securing the meters to undergo test and if 
vibration is excessive may be suspended or placed upon an air cushion which will 
tend to neutralize the vibration which might otherwise cause serious errors during 
test. A simple form of switchboard can be constructed to which may # be con- 
nected the potentials common to the system ; as, for instance, the lighting and 
power voltages which are in use such as 110, 220 or 550 volts. When the line 
voltage fluctuates and is difficult to read upon an instrument storage batteries are 
sometimes used. 

LOAD 

A bank of lamps to be used for load should be arranged and so connected 
to the switchboard as to permit any desired load to be easily applied. These 
lamps can be connected in steps of 1, 2, 3, etc., so that light and full load can easily 
be obtained. 

For heavy loads a water rheostat is often convenient, but the lamp method is 
generally used and will usually be found sufficient for the average testing. 

INSTRUMENTS 

To obtain the best results a suitable equipment of instruments is essential. For 
D.C. measurements a portable ammeter and voltmeter are required, while for A.C. 

32 



measurements an indicating wattmeter is preferable. Two instruments should 
be provided, one of sufficient capacity to take care of the full load of the meter, 
the other of small enough capacity to read the light load with a sufficient degree 
of accuracy. The use of this smaller range instrument avoids the chance of ob- 
servation errors such as will be found when reading a high capacity instrument 
at the lower end of the scale. 

In addition to the above equipment a reliable stop watch is essential for taking 
the meter speed. As a matter of safety it is advisable to have at least two stop 
watches, one to check the other in test. Too much care cannot be used in the 
handling of these watches and in giving them careful checks with some local jew- 
eler's standards. In checking the stop watch it is advisable to check at different 
points of the dial as stop watches are highly fallible and must be frequently checked. 

A portable recording wattmeter is sometimes used as standard, but with this 
method instruments are also required, as such standards should be checked from 
time to time. 

TESTING 

In order to insure accuracy independent of change in room temperature, it is 
necessary that the temperature co-efficient of the disk and of the potential circuit 
should be the same. Consequently, the temperature co-efficient of the potential 
circuit is such that the resistance will increase, due to heat generated in the coil. For 
this reason, meters should not be tested until they have been connected in circuit 
with the potential on for not less than 20 minutes, for if tested before this, they will 
run fast. In testing meters, a mark should be made upon the disk— near the outer 
edge in order that the time required for a certain number of revolutions of the 
disk may be accurately taken. The watts recorded by the meter, i.e., the rate at 
which the meter is recording, can be found by the formula : 

3600 x K x R 

— — ; — = watts 

11 R " Number of revolutions. 

" S " Number of seconds required to make this number of revolutions. 
/ Marked on dial face of " Non-direct " 

" K " The calibrating constant j reading meters and on meter disk of 
' " Direct " reading meters. 

" 3600 " Number of seconds in an hour. 

A number of revolutions should be so taken that the time of observation will 
be from 30 to 60 seconds. If materially less than 30, errors in the measurement of 
time are probable, and observations of longer than 60 seconds are generally un- 
necessary. 

Various methods have been used from time to time in measuring the rate at 
which a meter should record. A form of test, which has been common, is to 
connect a number of lamps to the meter and assume that each of the lamps con- 
sumes a certain amount of energy. 

While a test of this sort may be sufficient to determine a serious error it 
should only be looked upon as a rough test and not one from which accuracy can 
be expected. It is of course possible to take a number of lamps, calibrate them 
and know the wattage at certain voltages and make a test in this way. A rheostat 
can be used in a_similar manner. 

33 



None of these methods are considered as reliable as the instrument test 
described above. 

Whatever instruments may be used, the testers should be particularly cau- 
tioned not to allow the instruments to indicate the loss in the" potential circuit of 
the meter or vice versa as this would cause an error of appreciable magnitude in 
the light load operation. 

Below will be found a diagram of connections which should be closely fol- 
lowed in making tests. 




Line 



V. — Standard voltmeter, 

R.W.— Recording wattmeter under test, 

I.W. —Standard indicating wattmeter, 

A. — Standard indicating ammeter. 

For direct current measurements use V and A or I.W. 

For alternating current measurements use I.W. and V. 

Three-wire meters can readily be tested as two-wire by connecting the two 
current coils in series and using instruments as shown in the diagram for two 
wire. The calibrating constant of the meter must be divided by two (2) when 
making the test and so used in the formula. When testing as a three-wire meter 
two (2) sets of instruments are necessary, the calibrating constant being used as 
found on the meter. 

Polyphase meters. In testing polyphase meters it is better to check each side 
as an individual single-phase meter, and divide the calibrating constant by 
two. 

One side of the potential circuit should be opened while the opposite element 
is being tested, all the current windings being connected in series. 

READING METER REGISTERS 

As the dials of all pointer registers, whether for gas, water or electric meters, 
are more or less confusing, the preferable way to obtain readings is to have printed 
diagrams. (See page 35.) On these the man reading'the meter indicates with 
pencil the location of the pointer. All of the diagrams representing a complete 
system of meters are taken by a competent person and the correct indication in 
watt-hours is placed in the blank at the right of the diagram. Meters which are 
now shipped are provided with direct reading registers. As the name implies, the 
number of watt-hours is read directly from the dial and under no circumstances 
should any constant be used in reading the meter unless the words " Multiply by 

34 



10," "Multiply by 100," etc., appear on the dial face. This occurs only on meters 
of high capacities and amounts to adding one or more ciphers as the case may be to 
the indicated reading. Practically no change is made in the speed of the meters, 
the direct reading feature being accomplished by interposing the proper train of 
gears between the worm and the registering pointers. The constant placed on the 
meter disk or on the wooden terminal block corresponds to that constant which 
was placed on the dial of the older forms of meters before the direct reading 
register was adopted. This constant is used in calibrating and checking 
and must not be used in connection with the registering device. 

As there are positions of the pointers which are difficult to read, some care 
is necessary to correctly interpret the indications and the following instructions 
should be carefully noted : (See page 37.) 

The figures marked under or over' a dial (1030 and 10,000, etc.), are the amounts 
recorded by a complete revolution of the pointer ; therefore, one division on a dial 
indicates one-tenth of the amount indicated above or below it. A complete 
revolution of the first pointer in No. 6, for example, indicates 1000 and moves 
the second pointer one division of the second dial. The first pointer (the one to 
the extreme right) indicates 700— not 7000. 

In deciding on the reading of a pointer, the pointer before it (to the right) 
must be consulted. Unless the pointer before it has reached or passed the 0, or 
in other words, completed a revolution, the other has not completed the division 
on which it may appear to rest. For this reason ease and rapidity are gained by 
reading a meter register from right to left. For example, in No. 2, the first dial (the 
extreme right) reads 900. The second apparently indicates ; but since the first 
has not completed its revolution but indicates only 9 the second cannot have 
completed its division ; hence the second dial indicates 9 also. The same is true 
of the third dial; the second, being 9, has not quite completed its revolution, 
so the third has not completed its division ; therefore, we have 9. The same 
holds true of the pointer of the fourth dial. The last pointer (the extreme left) 
appears to rest on 1 ; but since the fourth is only 9, the last has not completed its 
division, and therefore indicates 0. Putting the figures down from right to left, 
the total reading is 999,900, though one might erroneously read 1,999,900, making a 
mistake of 1,000,000 units. 

The pointers sometimes become slightly misplaced, as shown in Nos. 8, 9 and 
10. In No. 8 we have on the first dial (the extreme right) ; we therefore put down 
three zeros, thus : 000. The pointer of the second dial is misplaced, for inasmuch 
as the first registers 0, the second should rest exactly on a division; we will 
therefore assume that it should have reached 8, making 8000. The remaining 
pointers are correct, and make a total of 9,928,000. A misplacement of this kind 
on the first or second dial makes no material difference in the amount. If, how- 
ever, it should occur on the third or fourth, comparisons of previous bills should be 
made. 

In No. 9 the second pointer is misplaced, for since the first indicates 1, the 
second should have just passed a division, and as it is nearest to the 8, we know 
it should have just passed that figure. The remaining three are approximately 
correct. The total reading is 9,918,100. 

36 



No. 1 



Xo. 2 



No. 3 



::xs iO.ooo 
df&SN /*fj\ <=>• 

-X4 Kfiy'Ve 5 4,/V s 5 -. 



8^ 



_£ WA^ - 






m 



Wh 



am 10.000 

i at 



S^fMl 



4 



m@^' 



ATTtiOU! 



: :: 



I 



:T^ 



: <£ 



°*Vf$m a :. 



No. 6 



Xo. 7 



No. 8 






No. 4 



No. 9 



No. 5 



i 

4 



No.10 



4 



No. 1 = 1.111,100 
No. 2= 999,900 
No. 3=1,000,100 
No. 4 = 9,999,500 
No. 5= 909,100 



No. 6= 99,700 
No. 7 = 9,912,100 
No. 8 = 9,928,000 
No. 9 = 9,918,100 
No. 10 = 9,928,300 



37 



In No. 10 the second pointer is behind its correct position. The total indica- 
tion is 9,928,300. 

By carefully following these directions little difficulty will be found in reading 
the meter even if the pointers become misplaced. 



CALIBRATION AND NAME-PLATE STAMPING 

Meters for both secondary and primary circuits will be calibrated and stamped 
as given in the following table. 

Meters which are received for repair or recalibration will be returned to 
customer with the original name-plate except those which are to be converted. 
Such meters will be stamped in accordance with table given below. If, however, 
it is necessary and the order so states, special calibration and name-plate stamping 
will be given. 



Volts 
Ordered For 


Amperes 
Capacity 


Volts 
Calibrated At 


Volts 
Stamped 


50 to 55 


All 


55 


50-55 


.100 to 110 


3 to 600 


110 


100-110 


100 to 110 


Above 600 


110 


110 


111 to 115 


3 to 600 


115 


111-115 


111 to 115 


Above 600 


As ordered 


As ordered 


116 to 120 


3 to 600 


120 


116-120 


116 to 120 


Above 600 


As ordered 


As ordered 


121 to 130 


3 to 600 


130 


121-130 


121 to 130 


Above 600 


As ordered 


As ordered 


200 to 220 


3 to 600 


220 


200-220 


200 to 220 


Above 600 


220 


220 


221 to 230 


3 to 600 


230 


221-230 


221 to 230 


Above 600 


As ordered 


As ordered 


231 to 240 


3 to 600 


240 


231-240 


231 to 240 


Above 600 


As ordered 


As ordered 


500 to 550 


3 to 600 


525 


500-550 


500 to 550 


Above 600 


550 


550 


551 to 600 


3 to 600 


575 


551-600 


551 to 600 


Above 600 


As ordered 


As ordered 


1000 to 1100 


All 


110 


1000-1100 


2000 to 2200 


All 


110 


2000-2200 



REGISTERS AND CONSTANTS 

The registers on all Thomson Recording meters manufactured previous to 
Forms J-2 and D-2, all Single Phase Induction meters, with the exceptions of 
Forms C-4, High Torque, and Polyphase meters manufactured previous to serial 



38 



number 475602, were equipped with non-direct reading dials ; i. e.. the readings 
have to be multiplied by a constant marked on the dial face in order to obtain the 
correct number of watt-hours registered. 

With the use of the direct reading pointer registers, meters are direct reading, 
or require only the use of constant 10 or a multiple of it. 

The following list gives meters which are literally direct reading and those 
having dial constants. 

THOMSON RECORDING AND THOMSON SINGLE-PHASE 

FORM C-4 AND ROUND PATTERN 

INDUCTION METERS 

DIRECT READING 



50- 55 Volts, 


5 to 


75 Amps. 


inclusive. 


100- 110 " 


3 to 


25 " 


" 


200- 220 " 


2-wire, 3 to 


15 " 


" 


200- 220 " 


3- wire, 3| to 


15 " 


" 


500- 550 " 


3 to 


5 " 


ti 




DIAL CONSTANT JO 




50- 55 Volts, 


100 to 


600 Amps. 


inclusive. 


100- 110 " 


50 to 


300 " 


" 


200- 220 " 


2-wire, 25 to 


200 " 


" 


200- 220 u 


3- wire, 25 to 


200 " 


" 


500- 550 " 


10 to 


75 " 


i< 


1000-1100 " 


3 to 


25 " 


" 


2000-2200 " 


3 to 


15 " 


" 


DIAL CONSTANT J 00 




50- 55 Volts 




1200 Amps. 




100- 110 " 


450 to 


3000 " 


inclusive. 


200- 220 " 


2-wire, 300 to 


1200 " 


" 


200- 220 " 


3-wire, 


300 " 




500- 550 " 


100 to 


600 " 


u 


1000-1100 ; ' 


50 to 


300 " 


it 


2000-2200 " 


25 to 


200 " 


(t 



DIAL CONSTANT 1000 
100- 110 Volts, 4000 to 10000 Amps, inclusive. 

200- 220 " 2-wire, 2000 to 10000 " 
500- 550 " 1200 to 6000 " 

1000-1100 " 450 to 600 " " 

2000-2200 " 300 to 600 " " 

DIAL CONSTANT J 0000 

500- 550 " 8000 to 10000 Amps, inclusive. 

39 



HIGH TORQUE INDUCTION METERS 

DIRECT READING 
100- 110 Volts, 3 to 25 Amps, inclusive. 

200- 220 " 2-wire, 3 to 10 " 
200- 220 " 3-wire, 3£ to 1\ " 
500- 550 " 3 to 5 " " 

DIAL CONSTANT JO 
100- 110 Volts, 50 to 150 Amps- inclusive. 

200- 220 " 2-wire, 15 to 150 " 
200- 220 " 3-wire, 15 to 150 " " 

500- 550 " 10 to 50 

DIAL CONSTANT J 00 
500- 550 Volts, 75 to 150 Amps, inclusive. 

THOMSON POLYPHASE METERS 

ROUND AND RECTANGULAR 

PATTERN 

DIRECT READING 

100- 110 Volts, 3 to 5 Amps, inclusive. 

200- 220 " 3 " 

DIAL CONSTANT JO 
100- 110 Volts, 10 to 75 Amps, inclusive. 

200- 220 " 5 to 25 " 

500- 550 " 3 to 15 " 

1000-1100 " 3 " 

2000-2200 " 3 " 

DIAL CONSTANT J 00 
100- 110 Volts, 100 to 150 Amps, inclusive. 

200- 220 " 50 to 150 " 

500-550 ." 25 to 150 " 

1000-1100 " 10 to 75 " 

2000-2200 " 10 to 25 " 

DIAL CONSTANT J 000 
1000-1100 Volts, 100 to 150 Amps, inclusive. 

2000-2200 " 50 to 150 " 

The dial constant is used only in reading meter register. 
The meter constant (written K) is the same constant which was placed on 
the dial before the direct reading register was adopted and is equal to the ratio of 
gearing (written r) multiplied by the dial constant. 

The disk constant (written k) is used in calibrating the meter and is placed 
on the meter disk, or on the terminal block, and may be determined for the various 
classes of meters in the following manner : 

2-wire, D.C., or single-phase, A. C? without transformers: 
k = K 

40 



3-wire, D.C., or single-phase, A.C. without transformers: 

>-? 

Single-phase or polyphase with transformers: 

k_ R 
(R = product of current and potential transformer ratios.) 
Note : Ratio of gears = number of divisions passed over by the first dial 
pointer per revolution of the worm wheel. 

CONSTANTS AND RATIO OF GEARS FOR* THOMSON 
RECORDING WATTMETERS, 3-J200 AMPERES 







Volts 


Amps. 


J,JN,J-1, 
FN, DN, D-l 


J-2 


D-2 




* Constant 


tCalibrat'g 
Constant 


Ratio 
Gears 


Dial 
Constant 






50-55 


5 


i 


0.1 


0.1 


None 






" 


10 


i 

2 


0.2 


0.2 


" 






" 


15 


1 
2 


0.3 


0.3 


" 






it 


25 


1 
2 


0.5 


0.5 


" 






" 


50 


1 


1.0 


0.1 


" 






" 


75 


o 


1.5 


1.5 


" 






11 


100- 


2 


2.0 


0.2 


10 






u 


150 


3 


3.0 


0.3 


10 






" 


200 


4 


4.0 


0.4 


10 






" 


300 


6 


6.0 


0.6 


10 


g 


" 


450 


10 


10.0 


1.0 


10 


1 


u 


600 


12 


12.5 


1.25 


10 


M 


1200 


24 


25.0 


0.25 


100 






100-110 


3 


i 


0.125 


0.125 


None 






" 


5 


i 

2 


0.2 


0.2 


u 






" 


10 


h 


0.4 


0.4 


M 






" 


15 


1 


0.6 


0.6 


" 






(I 


25 


1 


1.0 


1.0 


tc 






" 


50 


2 


2.0 


0.2 


10 






" 


75 


3 


3.0 


0.3 


10 






" 


100 


4 


4.0 


0.4 


10 






" 


150 


6 


6.0 


0.6 


10 




L 


" 


200 


8 


7.5 


0.75 


10 



* Non-direct reading register. 

t Direct reading register. Used in calibrating only, 
terminal board. 



Marked on disk and 



41 



CONSTANTS AND RATIO OF GEARS FOR THOMSON 

RECORDING WATTMETERS, 3-J200 AMPERES 

— Continued 







Volts 


Amps. 


LJN.J-1, 

FN, DN, D-l 


J-2 


D-2 




* Constant 


t Calibrat'g 
Constant 


Ratio 
Gears 


Dial 
Constant 






100-110 


300 


12 


12.5 


1.25 


10 






" 


450 


20 


20.0 


0.2 


100 






" 


600 


24 


25.0 


0.25 


100 






110 


1200 


48 


50.0 


0.5 


100 






200-220 


3 


\ 


0.25 


0.25 


None 








5 


§ 


0.4 


0.4 


44 








10 


l 


0.75 


0.75 


11 








15 


2 


1.25 


1.25 . 


u 








25 


2 


2.0 


0.2 


10 








50 


4 


4.0 


0.4 


10 








75 


6 


6.0 


0.6 


10 








100 


8 


7.5 


0.75 


10 








150 


12 


12.5 


1.25 


10 








200 


16 


15.0 


1.5 


10 


c 


J 




300 


24 


25.0 


0.25 


100 






450 


36 


40.0 


0.4 


100 




600 


48 


50.0 


0.5 


100 


c 


^ 


220 


1200 


96 


100.0 


1.0 


100 






500-550 


3 


1 


0.6 


0.6 


None 






" 


5 


1 


1.0 


1.0 


44 






" 


10 


2 


2.0 


0.2 


10 






44 


15 


5 


3.0 


0.3 


10 






14 


25 


5 


5.0 


0.5 


10 






44 


50 


10 


100 


1.0 


10 






44 


75 


15 


15.0 


1.5 


10 






44 


100 


20 


20.0 


0.2 


100 






44 


150 


30 


30.0 


0.3 


100 






" 


200 


40 


40.0 


0.4 


100 






ii 


300 


60 


60.0 


0.6 


100 






44 


450 


100 


100.0 


1.0 


100 






44 


600 


120 


125.0 


1.25 


100 




. 


550 


1200 


240 


250.0 


0.25 


1000 



* Non-direct reading register. 

t Direct reading register. Used in calibrating only. Marked on disk and 
terminal board. 

43 



CONSTANTS AND RATIO OF GEARS FOR THOMSON 

RECORDING WATTMETERS, 3-J200 AMPERES 

— Concluded 







Volts 


Amps. 


J, JN, J-l 
FN, DX, D-l 


J-2 




D-2 




* Constant 


t Calibrate 
Constant 


Ratio 
Gears 


Dial 
Constant 




r 


2U0-220 


3i 


i 

4 


0.25 


0.25 


None 






" 


n 


1 


0.6 


0.6 


" 






44 


15 


2 


1.25 


1.25 


44 


c 


D 


44 


25 


2 


2.0 


0.2 


10 




" 


50 


4 


4.0 


0.4 


10 


44 


75 


6 


6.0 


0.6 


10 






" 


100 


8 


7.5 


0.75 


10 






44 


150 


12 


12.5 


1.25 


10 






" 


200 


16 


15.0 


1.5 


10 






" 


300 


24 


25.0 


0.25 


100 




1000-1 KH) 


10 


3 


4.0 


0.4 


10 






44 


15 


5 


6.0 


0.6 


10 






44 


25 


10 


10.0 


1.0 


10 






44 


50 


20 


20.0 


0.2 


100 






44 


75 


30 


30.0 


0.3 


100 






44 


100 


40 


40.0 


0.4 


100 






44 


150 


60 


60.0 


0.6 


100 






44 


200 


80 


75.0 


0.75 


100 






44 


300 


120 


125.0 


1.25 


100 






u 


450 


150 


200.0 


0.2 


1000 


CO 


44 


600 


240 


250.0 


0.25 


1000 


2000-2200 


10 


6 


7.5 


0.75 


10 






44 


15 


10 


12.5 


1.25 


10 




" 


25 


20 


20.0 


0.2 


100 






• 4 


50 


40 


40.0 


0.4 


100 






44 


75 


60 


60.0 


0.6 


100 






14 


100 


80 


75.0 


0.75 


100 






44 


150 


120 


125.0 


1.25 


100 






44 


200 


160 


150.0 


1.5 


100 






44 


300 


240 


250.0 


0.25 


1000 






44 


450 


300 


400.0 


0.4 


1000 






44 


600 


480 


500.0 


0.5 


1000 



* Non-direct reading register. 

t Direct reading register. Used in calibrating only. 
;erminal board. 

43 



Marked on disk and 



CONSTANTS 

STATION ARC METERS 



NON-DIRECT READING 


REGISTERS 


DIRECT 


READING REGISTERS 


Amps. 


Volts 


Constant 


Calibrating 
* Constant 


Ratio Gears 


Dial 
Constant 


6.6 


1750 


7 


4.0 


0.4 


10 


6.6 


2500 


10 


7.5 


0.75 


10 


6.6 


3250 


13 


7.5 


0.75 


10 


6.6 


4000 


15 


10.0 


1.0 


10 


6.6 


5000 


20 


12.5 


1.25 


10 


6.6 


6250 


25 


15.0 


1.5 


10 


9.6 


1750 


7 


6.0 


0.6 


10 


9.6 


2500 


10 


10.0 


1.0 


10 


9.6 


3250 


13 


12.5 


1.25 


10 


9.6 


4000 


15 


15.0 


1.5 


10 


9.6 


5000 


20 


20.0 


0.2 


100 


9.6 


6250 


25 


25.0 


0.25 


100 



CEILING BOARD ARC METERS 



6.6 


200 


1 


1.0 


1.0 


None 


6.6 


400 


2 


2.0 


0.2 


10 


9.6 


200 


1 


1.0 


1.0 


None 


9.6 


400 


2 


2.0 


0.2 


10 



* Marked on meter disk. 



PORTABLE METERS 



3 


500-550 


1 




0.6 


0.6 


None 


15 


500-550 


5 




3.0 


0.3 


10 


25 


500-550 


5 




5.0 


0.5 


10 


50 


500-550 


10 




10.0 


1.0 


10 






*RAILW/ 


lY 


METERS 







25 


500-550 


5 








50 


500-550 


10 








100 


500-550 


20 








200 


500-550 


40 









k Cyclometer registers. 



44 



CONSTANTS FOR HIGH CAPACITY G-2 DIRECT 
CURRENT ASTATIC WATTMETERS 



NON-DIRECT 


READING REGISTERS 


DIRECT READING REGISTERS 




Volts 


Amps. 


Constant 


Calibrating 
* Constant 


Ratio 
Gears 


Dial 
Constant 




r 


110 


2500 


125 


125 


1.25 


100 




;t 


• 4000 


200 


200 


0.2 


1000 






44 


5000 


250 


250 


0.25 


1000 






" 


6500 


300 


300 


0.3 


1000 






" 


8000 


400 


400 


0.4 


1000 






11 


10000 


500 


500 


0.5 


1000 






220 


2500 


250 


250 


0.25 


1000 


c 


j 


" 


4000 


400 


400 


0.4 


1000 


t. 


" 


5000 


500 


500 


0.5 


1000 


£ 


" 


6500 


600 


600 


0.6 


1000 


c 


^ 


" 


8000 


800 


750 


0.75 


1000 






" 


10000 


1000 


1000 


1.0 


1000 






550 


2500 


500 


500 


0.5 


1000 






" 


4000 


800 


750 


0.75 


1000 






ii 


5000 


1000 


1000 


1.0 


1000 






" 


6500 


1300 


1250 


1.25 


1000 






" 


8000 


1600 


1500 


1.5 


1000 




^ 


E| 


10000 


2000 


2000 


0.2 


10000 



* Marked on meter disk. 



45 



CONSTANTS FOR HIGH CAPACITY GG-4 DIRECT 
CURRENT ASTATIC WATTMETERS 





Volts 


Amps. 


DIRECT 


READING REGISTERS 






Calibrating 
* Constant 


Ratio of 
Gears 


Dial 
Constant 






110 


2000 


100 


1.0 


100 






" 


3000 


150 


1.5 


100 






" 


4000 


200 


0.2 


1000 






" 


6000 


300 


0.3 


1000 






" 


8000 


400 


0.4 


1000 






<( 


10000 


500 


0.5 


1000 






220 


2000 


200 


0.2 


1000 






" 


3000 


300 


0.3 


1000 






" 


4000 


400 


0.4 


1000 






" 


6000 


600 


0.6 


1000 






<( 


8000 


750 


0.75 


1000 






tt 


10000 


1000 


1.0 


1000 






550 


2000 


500 


0.5 


1000 






" 


3000 


750 


0.75 


1000 






" 


4000 


1000 


1.0 


1000 






u 


6000 


1500 


1.5 


1000 






" 


8000 


2000 


0.2 


10000 






(( 


10000 


2500 


0.25 


10000 





* Marked on meter disk. 



46, 



CONSTANTS AND RATIO OF GEARS FOR THOMSON 

SINGLE -PHASE (FORM C-4) AND ROUND 

PATTERN INDUCTION METERS 



NON-DIRECT READING 


REGISTERS 


DIRECT READING REGISTERS 




Volts 


Amps. 


Constant 


Calibrating 
* Constant 


Ratio of 
Gears 


Dial 
Constant 




. 


100-110 


3 


i 


0.2 


0.2 


None 






5 


I 


0.25 


0.25 


" 






10 


i 

2 


0.5 


0.5 


" 






" 


15 


1 


0.6 


0.6 


11 






" 


25 


1 


1.0 


1.0 


" 






" 


50 


2 


2.0 


0.2 


10 






" 


75 


3 


3.0 


0.3 


10 






" 


100 


4 


4.0 


0.4 


10 




44 


150 


6 


6.0 


0.6 


10 


200-220 


3 


i 

4 


0.25 


0.25 


None 


c 


<l 


'• 


5 


2 


0.5 


0.5 


41 






" 


10 


1 


1.0 


1.0 


44 






" 


15 


2 


1.25 


1.25 


" 






'* 


25 


2 


2.0 


0.2 


10 






" 


50 


4 


4.0 


0.4 


10 






" 


75 


6 


6.0 


0.6 


10 






11 


100 


8 


7.5 


0.75 


10 




- 




150 


12 


12.5 


1.25 


10 


r 


200-220 


H 


i 

4 


0.25 


0.25 


None 




'• 


n 


1 


0.6 


0.6 


44 


£ 


" 


15 


2 


1.25 


1.25 


44 


$■ 


<« 


25 


2 


2.0 


0.2 


10 


14 


50 


4 


4.0 


0.4 


10 


CO 


" 


75 


6 


6.0 


0.6 


10 


1 


ii 


100 


8 


7.5 


0.75 


10 


I 


" 


150 


12 


12.5 


1.25 


10 




r 


1000-1100 


10 


5 


5.0 


0.5 


10 






CI 


15 


n 


7.5 


0.75 


10 






It 


25 


m 


12.5 


1.25 


10 






11 


50 


25 


25.0 


0.25 


100 






11 


75 


36 


40.0 


0.4 


100 


c 


j 


CI 


100 


50 


50.0 


0.5 


100 


"^ 


(1 


150 


75 


75.0 


0.75 


100 






200O-2200 


10 


10 


10.0 


1.0 


10 


. 




CI 


15 


15 


15.0 


1.5 


10 






t< 


25 


25 


25.0 


0.25 


100 






" 


50 


50 


50.0 


0.5 


100 






<< 


75 


75 


75.0 


0.75 


100 






<< 


100 


100 


100.0 


1.0 


100 




" 


<i 


150 


150 


150.0 


1.5 


100 



* Marked on meter disk and terminal board. 

47 



CONSTANTS AND RATIO OF GEARS FOR HIGH 

TORQUE INDUCTION METERS, DIRECT 

READING REGISTERS, 50-HO CYCLES 



100-110 VOLTS 


500-550 volts 


Amps. 


Cali- 
brating 
Constant 


Ratio of 
Gears 


Dial 
Constant 


Amps. 


Cali- 
brating 
Constant 


Ratio of 
Gears 


Dial 

Constant 


3 
5 
10 
15 
25 
50 
75 
100 
150 


0.2 
0.3 
0.6 
1.0 
1.5 
3.0 
5.0 
6.0 
10.0 


0.2 
0.3 
0.6 
1.0 
1.5 
0.3 
0.5 
0.6 
1.0 


None 
it 

10 
10 
10 
10 


3 
5 
10 
15 
25 
50 
75 
100 
150 


1.0 
1.5 
3.0 
5.0 
7.5 
15.0 
25.0 
30.0 
50.0 


1.0 

1.5 

0.3 

0.5 

0.75 

1.5 

0.25 

0.3 

0.5 


None 

10 

10 

10 

10 
100 
100 
100 


200-220 VOLTS, 2-WIRE 


200-220 VOLTS, 3- WIRE 


Amps. 


Cali- 
brating 
Constant 


Ratio of 
Gears 


Dial 
Constant 


Amps. 


Cali- 
brating 
Constant 


Ratio of 
Gears 


Dial 
Constant 


3 
5 
10 
15 

25 
50 
75 
100 
150 


0.4 
0.6 
1.25 
2.0 
3.0 
6.0 
10.0 
12.5 
20.0 


0.4 

0.6 

1.25 

0.2 

0.3 

0.6 

1.0 

1.25 

0.2 


None 

u 

10 
10 
10 
10 
10 
100 


3* 

15 

25 
50 
75 
100 
150 


0.5 
1.0 

2.0 

3.0 

6.0 

10.0 


0.5 
1.0 

0.2 
0.3 
0.6 
1.0 


None 

10 
10 
10 
10 



48 



CONSTANTS AND RATIO OF GEARS FOR 

POLYPHASE METERS, ROUND AND 

RECTANGULAR PATTERN 



NON-DIRECT READING 


REGISTERS 


DIRECT 


READING REGISTERS 


Volts. 


Amps. 


Constant 


Calibrating 

* Constant 


Ratio 
Gears 


Dial 
Constant 


100-110 


3 




0.6 


0.6 


None 


" 


5 


i 


1.0 


1.0 


" 


" 


10 


2 


2.0 


0.2 


10 


i< 


15 


3 


3.0 


0.3 


10 


" 


25 


4 


5.0 


0.5 


10 


" 


50 


8 


10.0 


1.0 


10 


" 


75 


12 


15.0 


1.5 


10 


" 


100 


16 


20.0 


0.2 


100 


" 


150 


24 


30.0 


0.3 


100 


200-220 


3 




1.25 


1.25 


None 


(c 


5 


*2 


2.0 


0.2 


10 


" 


10 


4 


4.0 


0.4 


10 


" 


15 


6 


6.0 


0.6 


10 


" 


25 


8 


10.0 


1.0 


10 


" 


50 


16 


20.0 


0.2 


100 


" 


75 


24 


30.0 


0.3 


100 


" 


100 


32 


40.0 


0.4 


100 


" 


150 


48 


60.0 


0.6 


100 


500-550 


3 


3 


3.0 


0.3 


10 


14 


5 


5 


5.0 


0.5 


10 


" 


10 


10 


10.0 


1.0 


10 


11 


15 


15 


15.0 


1.5 


10 


" 


25 


25 


25.0 


0.25 


100 


" 


50 


50 


50.0 


0.5 


100 


" 


75 


75 


75.0 


0.75 


100 


" 


100 


100 


100.0 


1.0 


100 


" 


150 


150 


150.0 


1.5 


100 


1000-1100 


3 


6 


6.0 


0.6 


10 


" 


10 


20 


20.0 


0.2 


100 


" 


15 


30 


30.0 


0.3 


100 


44 


25 


50 


50.0 


0.5 


100 


" 


50 


100 


100.0 


1.0 


100 


" 


75 


150 


150.0 


1.5 


100 


kt 


100 


200 


200.0 


0.2 


1000 




150 


300 


300.0 


0.3 


1000 


2000-2200 


3 


12.5 


12.5 


1.25 


10 


" 


10 


40 


40.0 


0.4 


100 


41 


15 


60 


60.0 


0.6 


100 


it 


25 


100 


100.0 


1.0 


100 


IC 


50 


200 


200.0 


0.2 


1000 


11 


75 


300 


300.0 


0.3 


1000 


u 


100 


400 


400.0 


0.4 


1000 




150 


600 


600.0 


0.6 


1000 



* Marked on meter disk. 



49 



COMPARATIVE SPEEDS OF METERS 

R. P. M. 





Volts 


Amps. 


Form 


Form 
*J-2 
*D-2 


Thomson 
*S ingle- 
phase (C4) 
Induction 


*High 

Torque 

Induction 

50-140- 


^Polyphase 






50-55 

it 
55 


5 

10 

15 

25 

50 

75 

100 

150 

200 

300 

450 

600 

1200 


20.8 
16.7 
25.0 
41.7 
41.7 
31.3 
41.7 
41.7 
41.7 
41.7 
37.5 
41.7 
41.7 


45.8 
45.8 
45.8 
45.8 
45.8 
45.8 
45.8 
45.8 
45.8 
45.8 
41.3 
44.0 
44.0 












100-110 


3 


25.0 


44.0 


27.5 


27.5 


18.3 






" 


5 


16.7 


45.8 


36.7 


30.6 


18.3 






" 


10 


33.3 


45.8 


36.7 


30.6 


18 3 






" 


15 


25.0 


45.8 


45.8 


27.5 


18.3 






" 


25 


41.7 


45.8 


45.8 


30.6 


18.3 






" 


50 


41.7 


45.8 


45.8 


30.6 


18.3 


fe 


" 


75 


41.7 


45.8 


45.8 


27.5 


18.3 


£ 


" 


100 


41.7 


45.8 


45.8 


30.6 


18.3 






" 


150 


41.7 


45.8 


45.8 


27.5 


18.3 


e 


^ 


110 


200 
300 
450 
600 
1200 


41.7 
41.7 
37.5 
41.7 
41.7 


48.9 
44.0 
41.2 
44.0 
44.0 












200-220 


3 


40.0 


44.0 


44.0 


27.5 


17.6 






'* 


5 


36.7 


45.8 


36.7 


30.6 


18.3 






" 


10 


36.7 


48.9 


36.7 


29.4 


18.3 






" 


15 


27.5 


44.0 


44.0 


27.5 


18.3 






" 


25 


45.8 


45.8 


45.8 


30.6 


18.3 






" 


50 


45.8 


45.8 


45.8 


30.6 


18.3 






C( 


75 


45.8 


45.8 


45.8 


27.5 


18.3 






" 


100 


45.8 


48.9 


49.0 


29.4 


18.3 






" 


150 


45 8 


44.0 


44.0 


27.5 


18.3 






" 


200 


45.8 


48.9 












u 


300 


45.8 


44.0 












ic 


450 


45.8 


41.2 












It 


600 


45.8 


44.0 










• 


220 


1200 


45.8 


44.0 









* Speed computed at highest voltage limit and with constants used on Direct 
reading registers. All others are based on lower voltage limit and Non-direct 
reading registers. 



50 



COMPARATIVE SPEEDS OF METERS— Concluded 

R.P.M. 





Volts 


Amps. 


Form 


Form 
*J-2 
*D-2 


Thomson 

*Single- 

phase (C4) 

Induction 


*High 

Torque 

Induction 

50-140- 


^Polyphase 




r 


500-550 


3 


25.0 


45.8 


45.8 


27.5 


18.3 










5 


41.7 


45.8 


45.8 


30.6 


18.3 










10 


41.7 


45.8 


45.8 


30.6 


18.3 










15 


25.0 


45.8 


45.8 


27.5 


18.3 










25 


41.7 


45.8 


45.8 


30.6 


18.3 


£ 






50 


41.7 


45.8 


45.8 


30.6 


18.3 


5 






75 


41.7 


45.8 


45.8 


27.5 


18.3 






100 


41.7 


45.8 


45.8 


30.6 


18.3 


1 






150 
200 
300 
450 
600 


41.7 
41.7 
41.7 
37.5 
41.7 


45.8 
45.8 
45.8 
41.2 
44.0 


45.8 


27.5 


18.3 


L 


550 


1200 


41.7 


44.0 








r 


20O-220 


31 


46.6 


51.3 


51.3 


25.6 








' 


n 


27.5 


45.9 


45.8 


27.5 








' 


15 


27.5 


44.0 


44.0 


27.5 




8 




' 


25 


45.8 


45.8 


45.8 


30.6 




% 




' 


50 


45.8 


45.8 


45.8 


30.6 








75 


45.8 


45.8 


45.8 


27.5 




CO 

1 






100 
150 

200 


45.8 
45.8 


48.9 
44.0 


48.8 
44.0 






I 


" 


300 














f 


1000-1100 


10 


55.5 


45.8 ■ 


45.8 


30.6 


18.3 






" 


15 


50.0 


45.8 


36.7 


27.5 


18.3 






" 


25 


41.7 


45.8 


36.7 


30.6 


18.3 






" 


50 


41.7 


45.8 


36.7 


30.6 


18.3 






" 


75 


41.7 


45.8 


34.3 


27.5 


18.3 






" 


100 


41.7 


45.8 


36.7 


30.6 


18.3 






" 


150 


41.7 


45.8 


36,7 


27.5 


18.3 






" 


200 


41.7 


48.8 












u 


300 


41.7 


44.1 












" 


450 


50.0 


41.2 










" 


600 


41.7 


44.1 








2000-2200 


10 


55.5 


48.8 


36.7 


29.4 


18.3 






' 




15 


50.0 


44.0 


36.7 


27.5 


18.3 






' 




25 


41.7 


45.8 


36.7 


30.6 


18.3 






' 




50 


41.7 


45.8 


36.7 


30.6 


18.3 






' 




75 


41.7 


. 45.8 


36.7 


27.5 


18.3 






' 




100 


41.7 


48.8 


36.7 


29.4 


18.3 






' 




150 


41.7 


44.0 


36.7 


27.5 


18.3 " 






1 




200 


41.7 


48.8 












i 




300 


41.7 


44.1 












' 




450 


50.0 


41.2 










- 






600 


41.7 


44.1 









* Speed computed at highest voltage limit and with constants used on Direct 
reading registsrs. All others are based on lower voltage limit and Non-direct 
reading registers. 

51 



COMPARATIVE SPEEDS OF HIGH CAPACITY G-2 
DIRECT CURRENT ASTATIC WATTMETERS 



NON-DIRECT READING REGISTERS 


*DIRECT 


READING REGISTERS 


Amps. 


100-110 


200-220 


500-550 


100-110 


200-220 


500-550 


Volts 


Volts 


Volts 


Volts 


Volts 


Volts 


2500 


36.7 


36.7 


45.8 ' 


36.7 


36.7 


45.8 


4000 


36.7 


36.7 


45.8 


36.7 


36.7 


48.8 


5000 


36.7 


36.7 


45.8 


36.7 


36.7 


45.8 


6500 


39.7 


36.7 


45.8 


39.7 


36.7 


47.7 


8000 


36.7 


36.7 


45.8 


36.7 


39.2 


48.8 


10000 


36.7 


36.7 


45.8 


36.7 


36.7 


45.8 



* Speed computed at highest voltage limit and with constants used on Direct 
reading registers. All others are based on lower voltage limit and Non-direct 
reading registers. 

COMPARATIVE SPEEDS OF HIGH CAPACITY GG-4 
DIRECT CURRENT ASTATIC WATTMETERS 

R. P,M* 





* 


DIRECT READING REGISTER 






Amps. 


100-110 


200-220 


500-550 






Volts 


Volts 


Volts 






2000 


36.7 


36.7 


36.7 






3000 


36.7 


36.7 


36.7 






4000 


36.7 


36.7 


36.7 






6000 


36.7 


36.7 


36.7 






8000 


36.7 


39.1 


36.7 






10000 


36.7 


36.7 


36.7 





* Speed computed at highest voltage limit and with constants used on direct 
reading registers. 

STATION ARC METERS 



NON-DIRECT READING 


REGISTERS 


DIRECl 


READING REGISTERS 


Amps. 


Volts 


R.P.M. 


Amps. 


Volts 


R.P.M. 


6.6 


1750 


27.5 


6.6 


1750 


48.2 


6.6 


2500 


27.5 


6.6 


2500 


36.7 


6.6 


3250 


27.5 


6.6 


3250 


47.6 


6.6 


4000 


29.3 


6.6 


4000 


44.0 


6.6 


5000 


27.5 


6.6 


5000 


44.0 


6.6 


6250 


27.5 


6.6 


6250 


45.7 


9.6 


1750 


40.0 


9.6 


1750 


46.7 


9.6 


2500 


40.0 


9.6 


2500 


40.0 


9.6 


3250 


40.0 


9.6 


3250 


41.5 


9.6 


4000 


42.9 


9.6 


4000 


42.6 


9.6 


5000 


40.0 


9.6 


5000 


40.0 


9.6 


6250 


40.0 


9.6 


6250 


40.0 



53 



CEILING BOARD ARC METERS WITH OR WITHOUT 
DIRECT READING REGISTERS 



Amps. 


Volts 


R.P.M. 


Amps. Volts 


R.P.M. 


6.6 
6.6 


200 
400 


22 
22 


9.6 200 
9.6 400 


32 
32 


PORTABLE METERS 


XOX-DIRE 


CT READING 


REGISTERS 


DIRECT READING REGISTERS 


Amps. 


Volts 


R.P.M. 


Amps. 


Volts 


R.P.M. 


3 
15 
25 
50 


500-550 
500-550 
500-550 
500-550 


25.0 
41.7 
41.7 
41.7 


3 
15 
25 

50 


500-550 
500-550 
500-550 
500-550 


45.8 
45.8 
45.8 
45.8 



ARMATURES 

Armatures for Thomson Recording Wattmeters of from 3 to 1200 amperes 
capacity are wound on one standard size of core. 

In order to identify any given winding, reference should be made to page 
54. which shows the different labels used in marking, i.e., Label Xo. 4 has vertical 
red band at either end and is used on 8 coil armature having 1000 turns per coil. 
These labels also bear the Serial number of the armature. 

To place a new armature in a meter, it is necessary to remove the brush 
bracket, the field coils and the magnets ; also to remove the disk from the shaft. 
The armature is held in place by set screws inside of the winding. These may be 
loosened by inserting a small screw driver. 

The ends of the commutator segments must be cleaned and the leads of the 
new armature carefully soldered in place, using resin dissolved in alcohol as flux. 

Special care must be taken that none of the solder runs down between the 
segments. 

After soldering in place, the armature should be allowed to hang by its own 
weight (suspended by its leads) from the commutator. The leads will then be 
straight, or, in other words, parallel with the meter shaft. 

If the armature has 8 coils, it will be found that every alternate tooth pro- 
jecting between the coils is exactly opposite the space between the commutator 
segments. Choosing one of these alternate teeth and calling it No. 1, count to 
the right six teeth. The sixth tooth will be found to be exactly opposite a com- 
mutator segment. Holding the shaft, the armature should be revolved upon it 
until tooth No. 6 occupies the previous position of tooth No. 1. 

If the armature has 16 coils, it will be noticed that every alternate tooth that 
projects between the coils will be exactly opposite a commutator segment. 
Choosing one of these alternate teeth and calling it No. 1, count six teeth to the 
right as before. The sixth tooth will be found to be exactly opposite a commuta- 
tor segment. The armature must then be revolved until tooth No. 6 occupies the 
previous position of tooth Xo. 1, thus giving the armature the same lead as before. 

53 



CHARACTERISTIC MARKINGS FOR THOMSON 
RECORDING WATTMETER ARMATURES 



L- *"—- 1 



16-500-S.S.C. 
.ooa 



©-650-S.S.C. 

.004- 



J 



16-250-S.S.C. 
.005 



Q-IOOO-S.5.C. 

.003 





: 





I6-200-S.S.C. 

.005 



8-400-5.C.C. 

.003 



<5-500-SS.C. 
.oo-f 



I6-300-S.S.C. 
.005 



&-AOOS.W.S. 
.000 



10 



6-900-8.S.C. 

.003 



Q-260-S.C.C. 
.005 



12 



8-500-S.S.C. 
.005 



13 



8— T50-S.a.C. 

.004 



14 



8-375-S.S.C. 
.005 



Red 



54 



ARMATURE DATA FORMS J, JN, )-i, J-2, FN, D, DN, 
EM, D-2 METERS 





Volts 


Amps. 


Form 


No. 

Coils 


Turns 


Wire 


Label 


Res. 


r 


5<>-55 
it 

M 

55 


3 
5 
10 
15 

15 

25 

50 

75 

100 

150 

200 

300 

450 

600 

1200 


JJ-1J-2 
D,D-l,D-2 


8 


260 
it 

it 


.005 sec 


.11 


120 




100-110 


3 


JN-J-lor2 


8 


1000 


.003 SSC 


4 


1180 




" 


5 


tt 


" 


900 


" 


10 


1050 




11 


5 


" 


1000 


" 


4 


1180 




" 


10 


J-l or 2 


u 


" 


" 


" 


" 




" 


15 


u 


" 


" 


" 


" 


" 




" 


15 


DN-FN-D-lor2 


" 


'* 


" 


" 


" 


g 


" 


25 


" 


" 


" 


" 


M 


M 


5 


n 


50 
75 


u 


" 


« 




« 


41 


c^ 


n 

110 


100 
150 
200 
300 
450 
600 
1200 


« 


» 


u 




1 


l 




200-220 


3 


JN-J-lor2 


16 


500 


.003 SSC 


i 


1180 




" 


5 


" 


" 




u 


" 


" 


" 




n 


10 


" 


" 




1 


" 


ii 


" 




11 


15 


" 


" 




1 


" 


ii 


" 




" 


15 


DN-FN-D-lor2 


it 




1 


11 


" 


" 




" 


25 


" 


" 




' 


ii 


" 


11 




" 


50 


it 


" 




' 


" 


m 


" 




" 


75 


" 


" 




' 


" 


u 


" 




" 


100 


" 


" 




1 


ii 


" 


" 




(1 


150 


" 


" 




' 


" 


" 


" 




u 


200 


" 


" 






" 


»* 


" 




" 


300 


" 


" 




1 


" 


it 


" 




fl 


450 


" 


" 




' 


" 


M 


" 




It 


600 


" 


" 




4 


" 


" 


kt 


^ 


220 


1200 




it 











55 



ARMATURE DATA FORMS JEN-J3-D3-DEN, J-J, D-J, 
J-2, D-2 METERS 





Volts 


Amps. 


Form 


No. 

Coils 


Turns 


Wire 


Label 


Res. 






500-550 


3 
5 
10 


JEN-J-lor2 


1 


6 


500 


.003SSC 


1 


1180 








1 


« 






ii 


« 


« 


« 








' 


15 


" 






" 


" 


" 


it 








" 


15 


DEN-D-1 or 2 






" 


" 


it 


" 








4 


25 


" 






" 


" 


ii 


" 


H 




' 


50 


it 






" 


" 


u 


" 


£ 

c^ 




£ 


75 


it 






it 


" 


" 


" 




' 


100 


" 






" 


" 


" 


" 




' 


150 


" 






" 


u 


u 


" 








' 


200 


" 






" 


" 


'* 


" 








' 


300 


" 






" 


" 


ii 


" 








1 


450 


" 






" 


ii 


" 


" 






u 


600 


" 






" 


" 


" 


" 




- 


550 


1200 


" 








" 


ii 


u 


r 


200-220 


3i 


J3-J-1 or 2 


$ 


1000 


.003 SSC 


4 


1180 






" 


n 


ti • 






650 


.004 SSC 


2 


425 






" 


n 






1000 


.003 SSC 


4 


1180 






" 


10 


J-l or 2 






" 


" 


" 


" 


CD 


" 


15 


D3-T-1 or 2 
D3-D-1 or 2 






" 


" 


" 


kt 


1 


il 


25 
50 






« 


" 


" 


" 


CO 


11 
(( 


75 
100 
150 
200 


ci 






» 


1 


" 


it 




1 




300 


(i 















ARMATURE DATA ON ARC CIRCUIT METERS 


Volts 


Amps. 


Type 


No. Coils 


Turns 


Wire 


Label 


Ohms 


1750 


6.6 


Station 


16 


300 


.005 SSC 


8 


280 


2500 


" 


" 






" 


" 


" 


3250 


" 


" 






" 


" 


'* 


4000 


" 


" 






" 


" 


" 


5000 


" 


" 






" 


" 


** 


6250 


ii 


" 






" 


" 


" 


1750 


9.6 


" 






'* 


" 


" 


2500 


" 


" 








" 


" 


3250 


" 


ii 






" 


u 


" 


4000 


" 


" 






" 


" 


" 


5000 


" 


" 






" 


" 


" 


6250 


" 


" 






" 


" 


" 


200 


6.6 


Ceiling- 
board 






" 


" 


" 










.005 SCC 






400 


" 


" 






" 


" 


" 


200 


9.6 


" 






" 


'* 


" 


400 

















56 



ARMATURE DATA FOR HIGH CAPACITY G-2 DIRECT 
CURRENT ASTATIC WATTMETERS 



Volts 



Amps. 



No. 
Coils 



Turns 
per Coil 



Wire 



Label 



Total 
Res. 



110 



220 



550 




500 .005 SSC 12 

375 " 14 



750 
500 



.004 SSC 
.005 SSC 



13 

12 



480 
360 



1100 
4S0 



750 


.004 SSC 


13 


1100 


500 


.005 SSC 
it 

it 


12 
u 


480 



This data applies to each armature except the resistance which is the total 
for both. 

ARMATURE DATA FOR PRIMARY METERS 

HIGH EFFICIENCY 



Volts 



Amps. Form 



No. 

Coils 



Turns 
per coil 



Wire Label T ^ 



1100-2200 



10 
15 
25 
50 
75 
100 
150 
200 
300 
450 
600 



J-l or 2 
D-l or 2 



1000 



.003 SSC 



1180 



57 



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3 3 3 


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135 ohms 


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61 





SHUNT COIL DATA FOR HIGH CAPACITY G-2 
DIRECT CURRENT ASTATIC WATTMETERS 



Volts 


Amps. 


Turns 
per Coil 


Wire 


Total 
Res. 


110 


2500 


500 


.005 SSC 


280 


" 


4000 


650 


.004 SSC 


570 


" 


5000 


750 


" 


660 


" 


6500 


750 


11 


660 


" 


8000 


750 


" 


660 


" 


10000 


750 


" 


660 


220 


2500 


500 


.005 SSC 


280 


" 


4000 


800 


.004 SSC 


700 


" 


5000 


800 


" 


700 


" 


6500 


1000 


.003 SSC 


880 


u 


8000 


800 


.004 SSC 


700 


" 


10000 


800 


it 


700 


550 


2500 


500 


.005 SSC 


280 


" 


4000 


800 


.004 SSC 


700 


" 


5000 


800 


" 


700 


u 


6500 


1000 


.003 SSC 


880 


a 


8000 


800 


.004 SSC 


700 


" 


10000 


800 


" 


700 



These meters are supplied with two shunt field coils. 

Data as given applies to each coil with exception of resistance which is total 
for both. 



62 



CARD OR TUBE RESISTANCE THOMSON RECORDING 
WATTMETERS 





Volts 


Amps. 


Form 


Resistance 
Ohms 


Form 


Resistance 
Ohms 




50-55 


3 


J, J-l 




J-2 








1 


5 


" 


287 


it 


240 






4 


10 


11 


287 


" 


240 






1 


15 


" 


222 


" 


240 






1 


25 


D, D-l 


187 


D-2 


240 






' 


50 


" 


187 


" 


240 






' 


75 


" 


177 


11 


240 






' 


100 


" 


177 


" 


240 






1 


150 


" 


177 


" 


240 






4 


200 


" 


202 


" 


240 






1 


300 


11 


247 


" 


240 






' 


450 


" 


247 


" 


240 




" 


600 


" 


247 


11 


240 




100-110 


3 
5 
10 


J-l 


1080 
1220 

980 


J-2 


1000 
1000 

1000 


a 


" 


15 


" 


1030 


" 


1000 


5 




25 


D-l 


730 


D-2 


1000 


i 


" 


50 
75 
100 
150 
200 
300 
450 
600 


n 


730 
730 
730 
730 
730 
730 
730 
730 


" 


1000 
1000 
1000 
1000 
1000 
1000 
1000 
1000 




110 


1200 


" 


1380 


tl 


1000 




200-220 


3 
5 
10 
15 


J-l 


2830 
2580 
2630 
2430 


J-2 


3340 
3340 
3340 
3340 




" 


25 


D-l 


2630 


D-2 


3340 




11 


50 


" 


2630 


" 


3340 




u 


75 


" 


2630 


" 


3340 






" 


100 


" 


2630 


" 


3340 



63 



CARD OR TUBE RESISTANCE THOMSON RECORDING 
WATTMETERS 





Volts 


Amps. 


Form 


Resistance 
Ohms 


Form 


Resistance 
Ohms 




200-220 


150 
200 
300 
450 
600 


D-l 


2630 
2630 
2630 
2630 
2630 


D-2 


3340 
3340 
3340 
3340 
3340 




220 


1200 




4080 


" 


3340 




500-550 


3 


J-l 


9460 


J-2 


10460 








5 




9460 


t< 


10460 


2 






10 




9460 


" 


10460 


is 

1 






15 




9460 


" 


10460 






25 


D-l 


9460 


D-2 


10460 








50 




9460 


" 


10460 








75 




9460 


11 


10460 








100 




9460 


" 


10460 








150 




9460 


" 


10460 








200 




9460 


" 


10460 








300 




9460 


" 


10460 








450 




9460 


" 


10460 








600 




9460 


" 


10460 


I 


550 


1200 




11180 


" 


10460 


r 


200-220 


3^ 


J-l 


1080 


J-2 


1000 








74 




1550 


" 


1000 








15 


D-l 


730 


D-2 


1000 








25 




730 


11 


1000 


.£ 






50 




730 


" 


1000 








75 




730 


u 


1000 






100 




730 


11 


1000 








150 




730 


" 


1000 








200 




730 


" 


1000 


L 






300 




730 




1000 



64 



TOTAL RESISTANCE AND WATT LOSS POTENTIAL 
CIRCUIT THOMSON RECORDING WATTMETERS 







> 


CO 

Q. 
£ 

< 


s 

p 


0) 

u 

C 

a 


to 

CO 

o 


a 

u 

o 


0) 

o 
C 

to £ 

■s»S 


co 

co 
O 

cd 




f 


50-55 


3 


J-J-a 






J-2 














5 


u 


557 


5.45 




510 


5.94 










10 


" 


557 


5.45 




510 


5.94 










15 


11 


479 


6.31 




510 


5.94 










25 


D-D-l 


432 


6.98 


D-2 


510 


5.94 










50 


" 


432 


6.98 




510 


594 










75 


" 


422 


7.12 




510 


5.94 










100 


(« 


422 


7.12 




510 


5.94 










150 


a 


422 


7.12 




510 


5.94 










200 


t< 


447 


6.8 




510 


5.94 










300 


" 


492 


6.14 




510 


5.94 










450 


<< 


492 


6.14 




510 


5.94 








600 


" 


492 


6.14 




510 


5.94 






100-110 


3 


J-l 


2540 


4.58 


J-2 


2500 


4.84 


i 


j 






5 


" 


2590 


4.67 




2500 


4.84 


$ 






10 


" 


2440 


4.96 




2500 


4.84 






15 


" 


2610 


4.64 




2500 


4.84 


c 








25 

50 

75 

100 


D-l 

a 

it 
it 


2310 
2310 
2230 
2230 


5.25 

5.25 
5.43 
5.43 


D-2 


2500 
2500 
2500 
2500 


4.84 
4.84 
4.84 

4.84 










150 


it 


2230 


5.43 




2500 


4.84 










200 


it 


2230 


5.43 




2500 


4.84 










300 


" 


2230 


5.43 




2500 


4.84 










450 


" 


2230 


5.43 




2500 


4.84 








600 


" 


2230 


5.43 




2500 


4.84 






110 


1200 


" 


2880 


4.2 




2500 


4.84 






200-220 


3 


J-l 


4990 


9.7 


J-2 


5000 


9.68 






(< 


5 


a 


4240 


11.40 


a 


5000 


9.68 






(< 


10 


(( 


4790 


10.1 


" 


5000 


9.68 




. 






15 




4590 


10.52 


(< 


5000 


9.68 



65 



TOTAL RESISTANCE AND WATT LOSS POTENTIAL 
CIRCUIT THOMSON RECORDING WATTMETERS 











8 


CO 

in 

O 






o 




'o 

> 


«5 

ft 

s 
< 


a 

u 
o 

to 


to w 


•*-> 

$ 


a 


to «g 

<U-CJ 








200-220 


25 


D-l 


4290 


11.28 


D-2 


5000 


9.68 






" 


50 


a 


4290 


11.28 




5000 


9.68 






" 


75 


<< 


4290 


11.28 




5000 


9.68 






44 


100 


44 


4290 


11.28 




5000 


9.68 






44 


150 


it 


4290 


11.28 




5000 


9.68 






44 


200 


tt 


4290 


11.28 




5000 


9.68 






44 


300 


44 


4290 


11.28 




5000 


9.68 






<< 


450 


i< 


4290 


11.28 




5000 


9.68 






44 


600 


44 


4290 


11.28 




5000 


9.68 






220 


1200 


a 


5640 


8.58 




5000 


968 


< 


i 


500-550 


3 


J-l 


11620 


26.05 


J-2 


12120 


24.92 


1 


c< 


5 


44 


11620 


26.05 




12120 


24.92 


44 


10 


<• 


11620 


26.05 




12120 


24.92 


c 


q 


» 4 


15 


<l 


11620 


26.05 




12120 


24.92 






44 


25 


D-l 


11620 


26.05 


D-2 


12120 


24.92 






i< 


50 


C< 


11620 


26.05 




12120 


24.92 






44 


75 


44 


11620 


26.05 




12120 


24.92 






44 


100 


44 


11620 


26.05 




12120 


24.92 






44 


150 


it 


11620 


26.05 




12120 


24.92 






44 


200 


tt 


11620 


26.05 




12120 


24.92 






44 


300 


(( 


11620 


26.05 




12120 


24.92 






tt 


450 


44 


11620 


26.05 




12120 


24.92 






44 


600 


% 


11620 


26.05 




12120 


24.92 






550 


1200 


44 


12800 


23.63 




12120 


24.92 




200-220 


31 


J-l 


2660 


4.55 


J-2 


2500 


4.84 




' 


»• 


n 




2415 


5.02 


44 


2500 


4.84 






(< 


15 


D-l 


2310 


5.25 


J-2 


2500 


4.84 






" 


25 


t< 


2310 


5.25 


D-2 


2500 


4.84 


& 


c< 


50 


44 


2310 


5.25 




2500 


4.84 


? 


» 


75 


" 


2310 


5.25 




2500 


4.84 


c 





<< 


100 


i< 


2310 


5.25 




2500 


4.84 






(i 


150 


44 


2310 


5.25 




2500 


4.84 






" 


200 


n 


2310 


5.25 




2500 


4.84 




" 


300 


" 


2310 


5.25 




2500 


4.84 



66 



TOTAL RESISTANCE AND WATTS LOSS IN POTEN- 
TIAL CIRCUIT OF HIGH CAPACITY G-2 DIRECT 
CURRENT ASTATIC WATTMETERS 



Volts 



Amps. 



Res. Ohms 



Watt Loss 



110 


2500 


1700 


7.12 


" 


4000 


1880 


6.45 


" 


5000 


1900 


6.35 


" 


6500 


1800 


6.77 


" 


8000 


2020 


5.96 


u 


10000 


2020 


5.96 


220 


2500 


4650 


10.4 


41 


4000 


4800 


10.2 


" 


5000 


4800 


10.2 


4: 


6500 


5370 


9. 


ii 


8000 


4800 


10.2 


" 


10000 


4800 


10.2 


550 


2500 


11600 


26.1 


44 


4000 


12000 


25.2 


44 


5000 


12000 


25.2 


14 


6500 


13400 


22.4 




8000 


12000 


25.2 




10000 


12000 


25.2 



67 



MAGNET STRENGTHS FOR THOMSON RECORDING 
WATTMETERS 

The magnet strength given in the following tables represents the sum or total 
of all the damping magnets. The individual strengths will be found marked on 
a tag, secured to the under side of the magnet. 





(/5 
> 


s 


6 


S 

S-i 

O 
ft 


c 
33 

c/2 


B 

u 

o 


j3 
"So 
c 

£ 

in 


a 

u 
O 


C 

in 


r 


50-55 


3 


2 


J 




J-l 




J-2 


400 






<< 


5 


2 


J 




J-l 


470 


J-2 


400 






" 


10 


2 


J 


640 


J-l 


630 


J-2 


380 






" 


15 


2 


J 


630 


J-l 


630 


J-2 


400 






" 


15 


3 


F 


630 




645 


D-2 


645 






" 


25 


3 


F 


630 


D-l 


645 


D-2 


615 






" 


50 


3 


F 


820 


D-l 


825 


D-2 


660 






(C 


75 


3 


F 


860 


D-l 


795 


D-2 


660 






" 


100 


3 


F 


600 


D-l 


615 


D-2 


615 






u 


150 


3 


F 


900 


D-i 


615 


D-2 


660 






tt 


200 


3 


D 


680 


D-l 


690 


D-2 


615 






11 


300 


3 


D 


860 


D-l 


855 


D-2 


690 






<t 


450 


3 


D 


750 


D-l 


750 


D-2 


690 






" 


600 


3 


D 


810 


D-l 


810 


D-2 


690 






55 


1200 


3 


EE 


1000 


D-l 


1040 


D-2 


1020 


\ 


i 


100-110. 


3 


2 


JN 


540 


J-l 


600 


J-2 


620 


£ 


" 


5 


2 


JN 


640 


J-l 


560 


J-2 


620 


c 


\ 


it 


10 


2 


JN 


440 


J-l 


440 


J-2 


590 






" 


15 


2 


JN 


630 


J-l 


630 


J-2 


620 






u 


15 


3 


FN 


900 




900 


D-2 


1005 






" 


25 


3 


FN 


640 


D-l 


720 


D-2 


975 






" 


50 


3 


FN 


940 


D-l 


930 


D-2 


1035 






" 


75 


3 


FN 


700 


D-l 


720 


D-2 


1035 






" 


100 


3 


FN 


720 


D-l 


735 


D-2 


960 






a 


150 


3 


FN 


980 


D-l 


960 


D-2 


1035 






" 


200 


3 


DN 


710 


D-l 


720 


D-2 


960 






(« 


300 


3 


DN 


990 


D-l 


990 


D-2 


1080 






" 


450 


3 


DN 


730 


D-l 


735 


D-2 


1095 






" 


600 


3 


DN 


990 


D-l 


1005 


D-2 


1035 






110 


1200 


3 


EEN 


1000 


D-l 


960 


D-2 


960 






200-220 


3 


2 


JN 




J-l 


410 


J-2 


620 






44 


5 


2 


JN 


360 


J-l 


410 


J-2 


620 






" 


10 


2 


JN 


490 


J-l 


690 


J-2 


550 




s. 


<( 


15 


2 


JN 


650 


J-l 


650 


J-2 


650 



68 



MAGNET STRENGTHS FOR THOMSON RECORDING 
WATTMETERS— Continued 





■T. 

'o 

> 


n 
< 


13 
P 

6 
z 


a 

u 

c 


"5) 

c 


£ 
u 

o 

to 


bo 

c 


£ 

o 
to 


ill 






200-220 


15 


3 


FN 


900 


J-l 


900 


D-2 


1050 






a 


25 


3 


FN 


810 


D-l 


795 


D-2 


975 






ii 


50 


3 


FN 


870 


D-l 


915 


D-2 


1035 






CI 


75 


3 


FN 


690 


D-l 


705 


D-2 


1035 






" 


100 


3 


FN 


650 


D-l 


660 


D-2 


900 






(C 


150 


3 


FN 


940 


D-l 


945 


D-2 


1080 






[{ 


200 


3 


DX 


600 


D-l 


630 


D-2 


960 






" 


300 


3 


DX 


930 


D-l 


960 


D-2 


1080 






" 


450 


3 


DX 


750 


D-l 


735 


D-2 


1090 






" 


600 


3 


DX 


960 


D-l 


975 


D-2 


1095 




220 


1200 


3 


EEX 


1020 


D-l 


990 


D-2 


990 


c 


; 


500-550 


3 


2 


JN 


540 


J-l 


610 


J-2 


590 


1 


" 


5 


2 


JN 




J-l 


470 


J-2 


620 


ii 


10 


2 


JN 


630 


J-l 


640 


J-2 


590 


e- 




" 


15 


2 


JN 


610 


J-l 


620 


J-2 


620 






" 


15 


3 


FN 


900 


D-l 


900 


D-2 


1005 






M 


25 


3 


FN 


680 


D-l 


645 


D-2 


975 






" 


50 


3 


FX 


900 


D-l 


915 


D-2 


945 






II 


75 


3 


FN 


945 


D-l 


615 


D-2 


1035 






" 


100 


3 


FN 


540 


D-l 


525 


D-2 


960 






II 


150 


3 


FN 


900 


D-l 


885 


D-2 


1035 






" 


200 


3 


DX 


610 


D-l 


645 


D-2 


1020 






" 


300 


3 


DX 


900 


D-l 


915 


D-2 


1035 






" 


450 


3 


DX 


750 


D-l 


735 


D-2 


1095 






IC 


600 


3 


DX 


960 


D-l 


915 


D-2 


1035 




L 


550 


1200 


3 


EEX 


980 


D-l 


1005 


D-2 


990 




200-220 


H 


2 


J-3 




J-l 


470 


J-2 


560 




" 


n 


2 


J-3 


590 


J-l 


680 


J-2 


590 






" 


15 


2 


J-3 


590 


J-l 


945 


J-2 


650 






n 


15 


3 


D-3 


670 


D-l 


945 


D-2 


1050 


K 


it 


25 


3 


D-3 


810 


D-l 


720 


D-2 


975 


g 


" 


50 


3 


D-3 


980 


D-l 


945 


D-2 


1035 


c^ 


" 


75 


3 


D-3 


720 


D-l 


720 


D-2 


1035 






" 


100 


3 


D-3 


660 


D-l 


630 


D-2 


900 




ii 


150 


3 


D-3 


940 


D-l 


945 


D-2 


1080 






200 


3 






D-l 


690 


D-2 


960 




l 


cc 


300 


3 






D-l 


885 


D-2 


j 1080 



69 



MAGNET STRENGTHS FOR THOMSON RECORDING 
WATTMETERS-Concltided 





tn 

'o 

> 


a 

<- 


8 

P 
6 


a 

U 

o 


be 

G 

$ 


a 

u 

o 


"So 

G 

in 


a 

u 

o 


! 


a 


bo 

G 

H 

tn 




f 


1000-1100 


10 


2 


*J 


360 


*J-1 


330 


J-i 


265 


J -2 


590 






" 


15 


3 


*J 


900 


*J-1 


1000 


D-l 


900 


D-2 


1005 






" 


25 


3 


* F 


780 


*D-1 


720 


D-l 


720 


D-2 


975 






" 


50 


3 


* F 


920 


*D-1 


930 


D-l 


930 


D-2 


1035 






u 


75 


3 


* F 


690 


*D-1 


710 


D-l 


720 


D-2 


1035 






u 


100 


3 


*F 


660 


*D-1 


670 


D-l 


735 


D-2 


960 






" 


150 


3 


*F 


950 


*D-1 


950 


D-l 


960 


D-2 


1035 






" 


200 


3 


*D 


820 


*D-1 


800 


D-l 


830 


D-2 


960 






u 


300 


3 


*D 


860 


*D-1 


870 


D-l 


990 


D-2 


1080 






" 


450 


3 


*D 


550 


*D-1 


650 


D-l 


550 


D-2 


1095 




" 


600 


3 


*D 


840 


*D-1 


840 


D-l 


1005 


D-2 


1035 


2000-2200 


10 


2 


*J 


360 


*j_! 


330 


J-l 


265 


J -2 


590 






" 


15 


3 


*J 


900 


*J-1 


1000 


D-l 


950 


D-2 


1005 






" 


25 




* F 


780 


*D-1 


720 


D-l 


720 


D-2 


975 






" 


50 


3 


* F 


920 


*D-1 


930 


D-l 


930 


D-2 


1035 






" 


75 


3 


*F 


690 


*D-1 


710 


D-l 


720 


D-2 


1035 






" 


100 


3 


* F 


660 


*D-1 


670 


D-l 


735 


D-2 


960 






" 


150 


3 


*F 


950 


*D-1 


950 


D-l 


960 


D-2 


1035 






" 


200 


3 


*D 


820 


*D-1 


800 


D-l 


830 


D-2 


960 






" 


300 


3 


*D 


860 


*D-1 


870 


D-l 


990 


D-2 


1080 






" 


450 


3 


*D 


550 


*D-1 


650 


D-l 


550 


D-2 


1095 






" 


600 


3 


*D 


840 


*D-1 


840 


D-l 


1005 


D-2 


1035 



*Low eff., J or J-l, D or D-l. 

MAGNET STRENGTHS FOR RAILWAY METERS 



Volts 


Amps. 


No. Used 


Direct and Non-direct Reading 


500-550 


25 


2 


630 


630 


500-550 


50 


2 


u 


t< 


500-550 


100 


2 


" 


w 


500-550 


200 


2 


660 


660 



70 



MAGNET STRENGTHS 

HIGH CAPACITY G-2 DIRECT CURRENT WATTMETERS 



Amps. 


No. Used 


110 Volts 


220 Volts 


550 Volts 


2500 


4 


1380 


1380 


1380 


4000 


4 


1380 


1380 


1380 


5000 


4 


1380 


1380 


1380 


6500 


4 


1380 


1380 


1380 


8000 


4 


1380 


1380 


1380 


10000 


4 


1380 


1380 


1380 



MAGNET STRENGTHS 

HIGH CAPACITY GG-4 DIRECT CURRENT ASTATIC WATTMETERS 



Amps. 


No. Used 


110 Volts 


220 Volts 


550 Volts 


2000 


4 


1380 


1380 


1380 


3000 


4 


1380 


1380 


1380 


4000 


4 


1380 


1380 


1380 


6000 


4 


1380 


1380 


1380 


8000 


6 


2070 


1950 


2070 


10000 


6 


2070 


2070 


2070 



MAGNET STRENGTHS FOR THOMSON SINGLE-PHASE 

FORM C-4 AND ROUND PATTERN 

INDUCTION METERS 





Volts 


Amps. 


No. Used 


60 to 125 
Cycles 




f 


100-110 


3 




125 






1 




5 




90 






1 




10 




140 


E 


1 




15 




125 


& 


1 




25 




100 


1 


« 




50 
75 




120 
125 




" 


100 




95 


^ 




150 




105 










71 







MAGNET STRENGTHS FOR THOMSON SINGLE-PHASE 
FORM C-4 AND ROUND PATTERN INDUC- 
TION METERS— Concluded 





Volts 


Amps. 


No. Used 


60 to 125 
Cycles 




f 


200-220 


3 
5 
10 




80 
90 
140 


2 


'" 


15 




125 




it 


25 




100 


" 


50 




120 






(C 


75 




125 






(I 


100 




95 


' 


„ 


l( 


150 




105 


\ 


200-220 

u 


3£ 

n 

15 




95 
110 
125 


a 


" 


25 




100 


is 


u 


50 




120 


CO 

1 


(( 


75 
100 




125 

95 


1 

I 


t( 


150 




105 


r 


1000-1100 


* 3 




85 






" 


5 




85 






it 
u 


10 
15 
25 
50 
75 
100 




125 
135 
140 
140 
140 
140 


.§ 


(( 


150 




140 


K 
C 


1 


2000-2200 


3 
5 
10 
15 

25 
50 

75 
100 




85 
85 
125 
135 
140 
140 
140 
140 




L 


" 


150 




140 



73 



MAGNET STRENGTHS FOR HIGH TORQUE 
INDUCTION METERS 





Volts 


Amps. 


No. Used 


50-59 
Cycles 


60 to 125 
Cycles 




r 


100-110 


3 


2 


430 


520 






(f 


5 


2 


430 


520 






14 


10 


2 


430 


500 






44 


15 


2 


450 


540 






44 


25 


2 


420 


500 






41 


50 


2 


460 


560 






" 


75 


2 


430 


520 






44 


100 


2 


260 


310 


( 


; 


44 


150 


2 


400 


480 


% 












c 


l 


200-220 


3 


2 


430 


520 






44 


5 


2 


430 


520 






44 


10 


2 


430 


500 






It 


15 


2 


450 


540 - 






44 


25 


2 


420 


500 






(I 


50 


2 


460 


560 






44 


75 


2 


430 


520 






44 


100 


2 


260 


310 


I 


44 


150 


2 


400 


480 


r 


200-220 


3^ 


2 


420 


540 


u 


n 


2 


400 


480 


1 

i 


u 


15 


2 


400 


480 


(C 


25 


2 


480 


570 


CO 

I 


" 


50 


2 


360 


380 


II 


75 


2 


480 


570 



73 



MAGNET STRENGTHS FOR POLYPHASE METERS 

RECTANGULAR PATTERN 



Volts 


Amps. 


No. Used 


40-50 
Cycles 


60 
Cycles 


100-110 


3 


2 


340 


475 


" . 


5 


2 


340 


475 


" 


10 


2 


350 


500 


11 


15 


2 


• 300 


450 


" 


25 


2 


270 


400 


11 


50 


2 


270 


290 


u 


75 


2 


380 


525 


C( 


100 


2 


280 


425 


" 


150 


2 


360 


550 


200-220 


3 


2 


340 


475 


" 


5 


2 


340 


475 


" 


10 


2 


350 


500 


11 


15 


2 


300 


450 


" 


25 


2 


270 


400 


" 


50 


2 


270 


290 


u 


75 


2 


380 


525 


" 


100 


2 


280 


425 


it 


150 


2 


360 


550 


500-550 


3 


2 


340 


475 


" 


5 


2 


340 


475 


" 


10 


2 


350 


500 


" 


15 


2 


300 


450 


" 


25 


' 2 


270 


400 


" 


50 


2 


270 


290 


u 


75 


2 


380 


525 


" 


100 


2 


280 


425 


tc 


150 


2 


360 


550 



74 



MAGNET STRENGTHS FOR POLYPHASE METERS 

ROUND PATTERN 



Volts 


Amps. 


No. Used 


25 
Cycles 


40 
Cycles 


60 
Cycles 


1000-1100 


3 


2 


190 


340 


400 




10 


2 


210 


380 


450 




15 


2 


190 


340 


400 




25 


2 


230 


410 


480 




50 


2 


210 


380 


450 




75 


2 


240 


430 


500 




100 


2 


210 


380 


450 




150 


2 


240 


430 


500 


2000-2200 


3 


2 


240 


430 


500 




10 


2 


210 


380 


450 




15 


2 


190 


340 


400 




25 


2 


230 


410 


480 




50 


2 


210 


380 


450 




75 


2 


240 


430 


500 




100 


2 


210 


380 


450 




150 


2 


240 


430 


500 



75 



LAMP AND HJ>. RATINGS 

DIRECT CURRENT AND SINGLE-PHASE METERS 



CAPACITY 


NUMBER OF 50 WATT INCANDESCENT 


HORSE-POWER 


OF METER 




LAMPS PER METER 




OF MOTORS 


Amps. 


2-Wire 
50-55 
Volts 


2-Wire 
100-110 
Volts 


3-Wire ' 
200-220 
Volts 


2-Wire 
200-220 
Volts 


2-Wire 

200-220 

Voits 


2-Wire 
500-550 
Volts 


3 


3 


6 




12 


1 


U 


H 






15 








5 


5 


10 




20 


n 


n 


n 






30 








10 


10 


20 


40 


40 


n 


5 


15 


15 


30 


60 


60 


h 


n 


25 


25 


50 


100 


100 


7 


15 


50 


50 


100 


200 . 


200 


15 


30 


75 


75 


150 


300 


300 


20 


50 


100 


100 


200 


400 


400 


25 


60 


150 


150 


300 


600 


600 


40 


100 


200 


200 


400 


800 


800 


50 


120 


300 


300 


600 


1200 


1200 


80 


200 


450 


450 


900 


1800 


1800 


125 


300 


600 


600 ' 


1200 


2400 


2400 


160 


400 


800 


800 


1600 


3200 


3200 


200 


480 


1200 


1200 


2400 


4800 


4800 


320 


800 


1500 


1500 


3000 




6000 


400 


1000 


2000 


2000 


4000 




8000 


500 


1200 


2500 


2500 


5000 




10000 


700 


1600 


3000 


3000 


6000 




12000 


800 


2000 


4000 


4000 


8000 




16000 


1000 


2400 


5000 


5000 


10000 




20000 


1400 


3200 


6000 


6000 


12000 




24000 


1600 


4000 


6500 


6500 


13000 




28000 


1725 


4500 


8000 


8000 


16000 




32000 


2200 


5400 


10000 


10000 


20000 




40000 


2800 


6400 



76 



KILOWATT AND H*P, RATINGS 

THOMSON POLYPHASE METERS FOR 3-WIRE 3-PHASE, 3 AND 

4-WIRE 2-PHASE, AND MONOCYCLIC CIRCUITS 

JOO-UO VOLTS 





KW. CAPACITY 


H. P. CAPACITY 


Capacity 


NON-INDUCTIVE LOADS 


MOTORS 


Amperes 


2- and 3-phase Monocyclic 


2- and 3-phase 
and Monocyclic 


3 


h 


i 

4 


1 


5 


1 


£ 


1 


10 


2 


l 


2 


15 


3 


H 


3 


25 


5 


3 


5 


50 


10 


5 


10 


75 


15 


8 


15 


100 


20 


10 


20 


150 


30 


15 


30 



200-220 VOLTS 



3 


1 


i 


1 


5 


2 


1 


2 


10 


4 


2 


3 


15 


6 


3 


5 


25 


10 


5 


10 


50 


20 


10 


20 


75 


30 


15 


30 


100 


40 


20 


40 


150 


60 


30 


60 



500-550 VOLTS 



3 


3 


H 


3 


5 


5 


3 


5 


10 


10 


5 


10 


15 


15 


8 


15 


25 


25 


12 


25 


50 


50 


25 


50 


75 


75 


40 


75 


100 


100 


50 


100 


150 


150 


»o 


150 



To measure output of generators, use Kw. capacity as given above. 

For circuits in excess of 150 amperes, current transformers are required ; two 
for each meter. 

For circuits above 650 volts, both current and potential transformers are 
necessary. 

77 



KILOWATT AND HJP, RATINGS 

THOMSON POLYPHASE METERS FOR 3-WIRE 3-PHASE, 3 AND 

4-WIRE 2-PHASE, AND MONOCYCLIC CIRCUITS — Concluded 

JOOO-UOO VOLTS 





KW. CAPACITY 


H. P. CAPACITY 


Capacity 


NON-INDUCTIVE LOADS 


MOTORS 


Amperes 


2- and 3-phase 


Monocyclic 


2- and 3-phase 
and Monocyclic 


3 


6 


3 


6 


10 


20 


10 


20 


15 


30 


15 


30 


25 


50 


25 


50 


50 


100 


50 


100 


75 


150 


75 


150 


100 


200 


100 


200 


150 


300 


150 


300 



2000-2200 VOLTS 



3 


12 


6 


12 


10 


40 


20 


40 


15 


60 


30 


60 


25 


100 


50 


100 


50 


200 


100 


200 


75 


300 


150 


300 


100 


400 


200 


400 


150 


600 


300 


600 



To measure output of generators, use Kw. capacity as given above. 

For circuits in excess of 150 amperes, current transformers are required; two 
for each meter. 

For circuits above 650 volts, both current and potential transformers are 
necessary. 



78 



CURRENT STUDS AND NUTS FOR INDUCTION, 

POLYPHASE AND THOMSON RECORDING 

WATTMETERS 







STUDS 




CONTACT NUTS 


CLAMPING NUTS 


03 
P. 

s 
< 


u 

s 


* 

c 




3 


S-c 


C/5 

If) 

s 

■a 

12 
H 


3 

a; 


T3 
CU 

P 

6 




on 
CO 

e 
p* 


H 


T3 
<U 

P 

d 


3 


1" 


5" 


20 


Brass 


1 « 
2 


i" 


Brass 


4 








5 


I" 


5" 


20 


" 


1 » 
2 


1" 

4 


" 


4 








10 


1" 


5" 


20 


" 


i" 


1" 


" 


4 








15 


r 


5" 


16 


Cu 


tt" 


i" 


" 


4 








25 


i" 


5" 


16 


" 


11" 

16 


3" 

8 


" 


4 








50 


i" 


5" 


16 


" 


H" 


3" 
8 


" 


4 








75 


2 


5" 


13 


11 


IxV 


r 


Cu 


4 








100 


1" 
2 


5" 


13 


11 


liV 


1" 
2 


" 


4 








150 


1" 
2 


5" 


13 


" 


uv 


1" 
2 


" 


4 








200 


5" 
8 


5" 


11 


" 


U" 


i" 


" 


4 








300 


1" 


5" 


11 


" 


U" 


5" 

8 


" 


4 








450 


3" 
4 


5" 


12 


u 


17" 

J-ie 


3" 


" 


4 








600 


7" 
8 


5" 


12 


" 


15" 
1 8 


7" 

8 


'* 


4 








1200 


ir 


5" 


12 


it 


W 


11" 
■ L 4 


(C 


4 








1500 


ir 


5r 


12 


" 


2|" 


1" 


Brass 


4 


2|" 


1" 

2" 


2 


2000 


if 


6 " 


12 


11 


3 " 


1 " 


(< 


4 


3 " 


h" 


2 


3000 


2 " 


7 " 


12 


" 


3|" 


1" 


Cu 


4 


3±" 


1" 


2 


4000 


2h" 


7 " 


12 


(C 


3£" 


1" 


" 


8 


31" 


1" 

5 


2 


6000 


U" 


10 " 


12 


" 


4|" 


, J" 


" 


8 


4|" 


1" 

2 


2 


8000 


4 " 


11|" 


12 


" 


5|" 


1 " 


11 


8 


5|" 


1" 
2 


2 


10000 


4f" 


14 " 


12 


" 


6 " 


1" 


n 


8 


6 " 


r 


2 



* Length of studs on meters with Form G covers is 6" in place of 5" and 5^" 



79 



*APPROXIMATE NET WEIGHTS OF 
IN POUNDS 



METERS 



FRONT CONNECTED 


BACK CONNECTED 






Thomson 
Single- 
phase Ind. 
Form C4 




ig 








c/5 
ft 

a 

< 


H 


0) 

~ ° s 

ffiHl-H 


Poly- 
phase 
Rectang 
lar Patte 




Thomps 
Single- 
phase In 
Round 
Pattern 


Poly- 
phase 
Round 
Pattern 


3 


14 


14 


20 


323 


183 


16 


57 


5 


14 


14 


20 


323 


183 


16 


57 


10 


14 


144 


_ 20 


323 


183 


16 


57 


15 


16 


14± 


20 


323 


203 


16 


57 


25 


25 


14i 


20 


323 


29* 


16 


57 


50 


25 


143 


20 


33 


293 


21 


58 


75 


25 


143 


20 


33 


293 


21 


58 


100 


25 


143 


20 


34 


293 


21 


59 


150 


29 


143 


20 


34 


33 


21 


59 


200 


333 








333 






300 


333 








333 






450 


353 








343 






600 


373 








353 






1200 


61| 








60 








FRONT C 


ONNECTED, 3-WIRE 






33 


14 


14 


20 










73 


14 


14 


20 










15 


16 


14* 


20 










25 


25 


14i 


20 










50 


25 


14£ 


20 










75 


253 


143 


20 










100 


26 


143 












150 


30 


143 












200 


34 














300 


34 















* Weights do not include external resistances of back connected meters, 
which is approximately 3 lbs. 



RAILWAY 


PORTABLE 


Amps. 




Amps. 




25 


283 


3 


22 


50 


28£ 


15 


223 


100 


29 


25 


23 


200 


30 


50 


24 



ARC METERS 





STATION TYPE 




CEILING BOARD TYPE 


Amps. 


Front Connected 


Back Connected 




6.6 
9.6 


21 
21 


22 

22 


203 
203 



80 



DIMENSIONS 

OF 

THOMSON RECORDING 
WATTMETERS 



DIMENSIONS 

To find the dimensions of a given meter, reference should be made to the 
following tabulations. 

THOMSON RECORDING WATTMETERS 





Volts 


Amps. 


FRONT CONNECTED 


BACK 


CONNECTED 


Resist.— 




Form 


Fig. 


Page 


Form 


Fig. 


Page 


Page 




50-55 


10 


J 




91 


RJ 


1 


96 


131 








15 


" 




" 


" 


1 


" 












25 


F 




92 


RD 


2 


" 












50 


" 




" 




2 


it 












75 


" 




<( 




1 


97 












100 


it 




93 




1 


(< 












150 


" 




M 




1 


" 












200 


DE 




94 




2 


" 












300 


<t 




" 




2 


i< 












450 


<( 




it 




1 


98 












600 


" 




95 




2 


" 








55 


1200 


EE 




" 


REE 


1 


99 








100-110 


5 


JN 




91 


RJN 


1 


96 












10 


" 




" 


u 


1 


" 












15 


tt 




" 


<( 


1 


" 












25 


FN 




92 


RDN 


2 


tt 












50 


u 




" 


11 


2 


" 






03 






75 


<< 




" 


<( 


1 


97 






1 
05 






100 


" 




93 


*' 


t 


tt 










150 
200 


<( 

DEN 




94 


n 


1 
2 


a 












300 


,( 




" 


" 


2 


11 












450 


i( 




M 


11 


2 


98 












600 


n 




95 


" 


2 


" 








110 


1200 


EEN 




" 


REEN 


1 


99 








200-220 


5 


JN 




91 


RJN 


1 


96 












10 


<< 




" 


" 


1 


" 












15 


tt 




" 


" 


1 


IL 












25 


FN 




92 


RDN 


2 


a 












50 


" 




" 


" 


2 


" 












75 


a 




n 


" 


1 


97 












100 


" 




93 


" 


1 


" 












150 


<< 




(< 


u 


1 


" 












200 


DEN 




94 


tt 


2 


" 












300 


" 




" 


" 


2 


a 












450 


a 


2 


*' 


" 


1 


98 












600 


a 


1 


95 


" 


2 


" 








220 


1200 


EEN 


2 


" 


REEN 


1 


99 







82 



DIMENSIONS OF THOMSON RECORDING 
WATTMETERS 









FRONT CONNECTED 


BACK 


CONNECTED 


Resist.— 




Volts 


Amps. 




























Page 








Form 


Fig. 


Page 


Form 


Fig. 


Page 


f 


500-600 


5 


JEN 


2 


91 


RJN 


1 


96 


131 






10 


IC 


2 


(i 


" 


1 


it 


" 






15 


II 


2 


<< 


11 


1 


if 


tt 






25 


EN 


2 


92 


RDX 


2 


" 


" 






50 


u 


2 


if 


" 


2 


it 


44 


£ 




75 


a 


2 


" 


n 


1 


97 


n 


5 




100 


u 


2 


93 


i< 


1 


tt 


" 


A 




150 


if 


2 


" 


tf 


1 


(C 


tt 






200 


DEN 


1 


94 


(i 


2 


If 


41 






300 


u 


1 


" 


it 


2 


" 


it 






450 


(I 


2 


(i 


if 


1 


98 


44 






600 


If 


1 


95 


m 


2 


tf 


it 


- 


550 


1200 


EEN 


2 


" 


REEN 


1 


99 


14 


r 


200-220 


3* 


J-3 


1 

1 


100 
if 


RJ-3 


1 
1 


102 


If 


i 

0) 




15 


D-3 


2 


it 


RD-3 


2 




44 


J. 

1 




25 


" 


2 


" 


" 


2 




44 




50 


t( 


2 


tl 


if 


2 




44 




75 


M 


2 


(i 


it 


2 




ft 






100 


" 


1 


101 


" 


1 


103 


" 


I 


" 


150 




1 


" 


it 


1 


" 





83 



DIMENSIONS OF THOMSON RECORDING 
WATTMETERS 









</5 

a 
S 
< 


FRONT CONNECTED 


BACK CONNECTED 








'o 

> 


a 

o 


bi 

E 


be 


s 

9-4 

o 




9 
Oh 


1. 

c« bo 




50-55 


3 


J-l or 2 




104 


J-l or 2 


i 


114 


131 








5 








u 




i 


" 












10 








" 




i 


" 












15 








II 


D-l or 2 


2 


" 












25 


D-l 


or 2 




105 




2 


11 












50 








ii 




2 


" 












75 








106 




1 


115 












100 








107 




1 


" 








4 




150 








" 




1 


u 












200 








108 




2 


11 












300 








" 




2 


" 












450 








109 




1 


116 










600 








110 




2 


" 








55 


1200 








111 




1 


117 








100-110 


3 


J-l or 2 




104 


J-l or 2 


1 


114 


131 




14 
II 
II 

II 
II 

110 


5 

10 

15 

25 

50 

75 

100 

150 

200 

300 

450 

600 

1200 


D-l 


or 2 




u 

105 

106 
107 

108 
(t 

109 
110 
111 


D-l or 2 


1 

1 
2 
2 
2 

1 

1 
1 
2 
2 
1 
2 
1 


115 
i< 

it 

116 
117 








200-220 
u 


3 
5 
10 
15 


J-l or 2 

it 
it 




104 
ti 

ci 


J-l or 2 
D-l or 2 


1 
1 
1 
2 


114 
ii 


131 




i 




25 


D-l 


or 2 




105 


<( 


2 









84 



DIMENSIONS OF THOMSON RECORDING 
WATTMETERS— Continued 









ft 

s 

< 


FRONT 


CONNECTED 


BACK CONNECTED 






O 
> 


2 
u 

O 


fcJD 


9 
p-. 


s 

u 

o 




0) 

bo 


1. 

'en &D 




200-220 


50 


D-l or 2 




105 


D-l or 2 


2 


114 


131 








75 






106 




1 


115 


" 








100 






107 




1 


" 


" 








150 






t< 




1 


EC 


" 








200 






108 




2 


tl 


11 








300 






it 




2 


" 


" 








450 






109 




1 


116 


" 








600 






110 




2 


" 


11 




220 


1200 






111 




1 


117 


k 




500- 


-600 


3 

5 

10 


J-l or 2 


2 
2 
2 


104 


J-l or 2 


1 
1 
1 


114 
it 

n 


131 


C[5 


< 




15 
25 

50 
75 

100 
150 
200 
300 
450 
600 


D-l or 2 


2 
2 
2 
2 
2 
2 


105 
<( 

106 
107 

108 

109 
110 


D-l or 2 


2 
2 
2 

1 
1 
1 
2 
2 
1 
2 


(i 

115 

u 

116 


II 

M 


[ 


550 


1200 






111 




1 


117 


" 




200-220 


3§ 


J-l or 2 




112 


J-l or 2 


1 


118 


131 








H 






" 




1 


" 


". 








10 






" 




2 


" 


" 








15 


D-l or 2 


2 


11 


D-l or 2 


2 


11 


" 


QJ 






25 




o 


" 




2 


u 


" 


> 






50 




2 


u 




2 


" 


ii 


cc 






75 
100 
150 
200 




2 

1 
1 
2 


113 




1 
1 
1 
2 


119 
(i 

a 


131 








300 




2 


(C 




2 


u 





85 



DIMENSIONS 

PRIMARY METERS 



Amps. 


1000-1100 VOLTS 


BACK CONNECTED 


2000-2200 volts, 

BACK CONNECTED 


Form 


Fig. 


Page 


Resist.— 
Page 


Form 


Fig. 


Page 


Resist.— 
Page 


10 


J-l or 2 


1 


114 


131 


J-l or 2 


1 


114 


131 


15 


D-l or 2 


2 


" 






D-l or 2 


2 


" 






25 






2 


" 










2 


" 






50 






2 


" 










2 


" 






75 






1 


115 










1 


115 






100 






1 


" 










1 


" 






150 






1 


<t 










1 


" 






200 






2 


<< 










2 


" 






300 






2 


a 










2 


" 






450 






1 


116 










1 


116 






600 






2 


u 










2 


" 







DIMENSIONS 

ARC CIRCUIT METERS, STATION TYPE 



Front 
Connected 



Back 
Connected 



Resistance 
Cage 



Amps. 



6.6 & 9.6 



Volts 



Page 



Page 



Page 



No. Used Fig, 



1750 
2500 
3250 
4000 
5000 
6250 



120 



121 



121 



ARC METERS, CEILING BOARD TYPE 


Amps. 


Volts 


Page 


Resistance 


6.6 & 9.6 


200 & 400 


122 


In meters 



86 



DIMENSIONS 



HIGH CAPACITY GG-3 AND GG-4 DIRECT CURRENT ASTATIC 
WATTMETERS 



Amp. Capacity 


Form 


Wire 


Page 


Resistance — 
Page 


800-1500 
2000-6000 
8000-10000 

800-1500 
2000-6000 


GG-3 
GG-4 
GG-4 
GG-3 
GG-4 


2 
2 
2 
3 
3 


123 
124 
125 
126 
127 


131 

a 

it 


TWO-RATE METERS 




Meter 


Clock Mechanism — 
Page 



The dimensions of the meters are same as for similar 
capacities of TR Wattmeters , 



128 



PREPAYMENT METERS 



Meter 


Prepayment Device — 
Page 


The dimensions of the meters are same as for similar 
capacities of TR Wattmeters 


129 



RAILWAY METERS 





Amps. 


Figure 


Page 




25 


1 


130 






50 


1 


11 






100 


2 


44 






200 


2 


it 





87 



DIMENSIONS OF 2-WIRE THOMSON SINGLE-PHASE, 

FORM C-4 AND ROUND PATTERN 

INDUCTION METERS 

25 TO 50 CYCLES 



FRONT CONNECTED 


BACK CONNECTED 


Amps. 


Page 


Figure 


Reactive 
Coil- 
Page 


Page 


Figure 


Reactive 
Coil- 
Page 


3 


132 




131 


133 




131 


5 






" 






" 


10 






" 






(< 


15 






« 






" 


25 






u 






11 


50 




2 


" 




2 


" 


75 




2 


14 




2 


c< 


110 




2 


(( 




2 


" 


150 




2 


4 




2 


■" 







60 TO J25 CYCLES 








3 


132 




In meter 


133 




In meter 


5 








1 








' 


10 








' 








i 


15 








' 








4 


25 








' 








1 


50 




2 




1 




2 




4 


75 




2 




c 




2 




1 


100 




2 




' 




2 




' 


150 




2 






2 





88 



DIMENSIONS OF 3-WIRE THOMSON SINGLE-PHASE, 
FORM C-4 INDUCTION METER 

25 TO 40 CYCLES 

FRONT CONNECTED 



Amps. 


Page 


Figure 


Reactive Coil— Page 


31 


134 


1 


131 


7* 




1 




15 




1 




25 




1 




50 




2 




75 




2 




100 




2 




150 




2 







60 TO 125 


CYCLES 




3£ 


134 


1 


In meter 


71 
'5 




1 




15 




1 




25 




1 




50 




2 




75 




2 




100 




2 




150 




2 





HIGH TORQUE INDUCTION METERS 

40 TO 125 CYCLES 



TWO-WIRE 


THREE-WIRE 


Amps. 


Page 


Figure 


Amps. 


Page 


Figure 


3 


135 




3* 


135 


2 


5 


" 




7| 




2 


10 


" 




15 




2 


15 


< 




25 




2 


25 


" 




50 




2 


50 


" 




75 




2 


75 


" 










100 


" 










. 150 













89 



DIMENSIONS OF THOMSON POLYPHASE 
INDUCTION METERS 

25 CYCLES 



RECTANGULAR PATTERN 


ROUND PATTERN 


FRONT CONNECTED 


BACK CONNECTED 


Amps. 


Page 


Figure 


Reactive 
Coil- 
Page 


Page 


Reactive 
Coil- 
Page 


3 


136 




131 


137 


131 


5 












10 












15 












25 












50 












75 












.100 




2 








150 




2 









40 TO 125 CYCLES 



3 
5 
10 
15 
25 
50 
75 
100 
150 



136 



In meter 



137 



In meter 



90 



DIMENSIONS OF FRONT CONNECTED TWO-WIRE 
T. R- WATTMETERS 

5-15 AMPS. 50-600 VOLTS 
FORMS J, JN AND JEN 




r is^ 



EdQie 



Amps. Volts 


Form Fig. 


5-15 
5-15 


50-220 
500-600 


J,JN 
JEN 


1 
2 



* Indicates space necessary to remove cover. 
Form J, 50 volts only. 

91 



DIMENSIONS OF FRONT CONNECTED TWO-WIRE 
T* R, WATTMETERS 

25 TO 75 AMPS. 50-600 VOLTS 
FORMS F, FN AND EN 

"1 



FTgl. 



Fig2 




Amps. 


Volts 


Form 


Fig. 


25-75 
25-75 


50-220 
220-600 


F-FN 
EN 


1 
2 



* Indicates space necessary to remove cover. 
Form F, 50 volts only. 

93 



DIMENSIONS OF FRONT CONNECTED TWO -WIRE 
T. R. WATTMETERS 

J 00- J 50 AMPS, 50-600 VOLTS 
FORMS F, FN AND EN 




Amps. 


Volts 


Form 


Fig. 


100-150 
100-1.50 


50-220 
500-600 


F-FN 

EN 


1 
2 



♦Indicates space necessary to remove cover, 
Form F, 50 volts only. 

1>3 



DIMENSIONS OF FRONT CONNECTED TWO-WIRE 
f ♦ R, WATTMETERS 

200 TO 450 AMPS.— 50-600 VOLTS 
FORMS DE AND DEN 



Fjgl. 



Fi^2. 




Amps. 


Volts 


Form 


Fig. 


200-300 
450 


50-600 
50-600 


DE-DEN 
DE-DEN 


1 
2 



indicates space necessary to remove cover. 
Form DE, 50 volts only. 

94 



DIMENSIONS OF FRONT CONNECTED TWO -WIRE j 
T. R, WATTMETERS 

600-J200 AMPS,, 50-600 VOLTS 
FORMS DE, DEN, EE AND EEN 




LHpi 







. ' ^ — J 










Amps. 


! Volts 


Form 


Fig. 


Amps. 


Volts 


Form 


Fig. 


600 


1 50-600 


DE-DEX 


1 


1200 


50-600 


EE-EEX 


2 



♦Indicates space necessary to remove cover. 
Forms DE and EE, 50 volts only. 

95 



DIMENSIONS OF BACK CONNECTED TWO-WIRE 
T. R. WATTMETERS 

5-50 AMPS., 50-600 VOLTS 
FORMS RJ, RJN, RD AND RDN 




T7 _ r.i'i..i '■ • ■■ 



i \C 7i'-.-4l 




r . — 



iatud I— — 



m 



J_L 




, 2 FJ! * 



'7~T 

£ L. 



iei 



5S* 



'IT" 



-ft 



I I af 1 I 

I oft" -J 



4-i— 



J i' 



-5- 






-si 



<£— I. 



Amps. 


Volts 


Form 


Figs. 


3-15 
25-50 


50-600 
50-600 


RJ, RJN 
RD, RDN 


1 
2 



* Indicates space necessary to remove cover. 
Forms RJ and RD, 50 volts only. 

96 



DIMENSIONS OF BACK CONNECTED TWO -WIRE 
T. R. WATTMETERS 

75 TO 300 AMPS. 50-600 VOLTS 
FORMS RD AND RDN 




.1 ,11. 

-,o,|' 1 



||£^__ 



-_e£_. 



Fig,2. 




Wm 



TT 
I I 

Ms* 



jtfctote I- S||' , _ 



& 



L 



I ' ty -jJ-JLl— 



I I 

II- S£" II 

U 10,#" J 



T 

i_ 



Ik*-^- 



Amps. 


Volts Form Fig. 


75-150 
200-300 


50-600 
50-GOO 


RD, RDN 1 
RD, RDN 2 



♦Indicates space necessary to remove cover. 
Form RD, 50 volts only. 

97 



DIMENSIONS OF BACK CONNECTED TWO -WIRE 
T. R, WATTMETERS 

450 TO 600 AMPS. 50-600 VOLTS 
FORMS RD AND RDN 



Pig.1. 




Fi^e. 



Amps. 


Volts 


Form 


Fig. 


450 
600 


50-600 
50-600 


RD, RDN 
RD, RDN 


1 
2 



* Indicates space necessary to remove cover. 
Form RD, 50 volts only. 

98 



DIMENSIONS OF BACK CONNECTED TWO -WIRE 
T. R. WATTMETERS 

1200 AMPS. 50-600 VOLTS 
FORMS REE AND REEN 




ill L 

1 1- ai A i 

I eg- 



Amps. 



Volts 



Form 



Fig. 



1200 



50-600 



REE, REEN 



* Indicates space necessary to remove cover. 
Form REE, 50 volts only. 

Lore. 



99 



DIMENSIONS OF FRONT CONNECTED THREE-WIRE 
T, R, WATTMETERS 

3|-75 AMPS., 200-220 VOLTS 
FORMS J-3 AND D-3 

TT 




Amps. 


Volts 


Form 


Fig. 


15-75 


200-220 
200-220 


J-3 
D-3 


1 
2 



* Indicates space necessary to remove cover. 

100 



DIMENSIONS OF FRONT CONNECTED THREE -WIRE 
T. R* WATTMETERS 

J 00-150 AMPS. 200-220 VOLTS 
FORM D-3 




ue«? 



Amps. 


Volts 


Form 


Fig. 


100-150 


200-220 


D-3 


1 



* Indicates space necessary to remove cover. 



101 



DIMENSIONS OF BACK CONNECTED THREE-WIRE 
T. R. WATTMETERS 

Sh-75 AMPS. 200-220 VOLTS 
FORMS RJ-3 AND RD-3 

m r ~^ r 

si 



Fja.1- 



Fig2 




L qL" 



Amps. 


Volts 


Form 


Fig. 


15-75 


200-220 
200-220 


RJ-3 
RD-3 


1 
2 



* Indicates space necessary to remove cover. 

103 



DIMENSIONS OF BACK CONNECTED THREE-WIRE 
T. R- WATTMETERS 

J 00- J 50 AMPS, 200-220 VOLTS 
FORM RD-3 



rig. I. 



Sdok 




zSbyd] 



: 




I r*~ 



I — o= — I l-g 



-io|" A 






Amps. 


Volts 


Form 


Fig. 


100-150 


200-220 


RD-3 


1 



^Indicates space necessary to remove cover. 



103 



DIMENSIONS OF FRONT CONNECTED TWO -WIRE 
T. R- WATTMETERS 

3 TO J5 AMPS, 50-600 VOLTS 
FORMS J-J AND J-2 

-t~-H rr.. 



1 7&** 



Fi£.l 



l|tioie_^ 




f%HM#i 



Fi<££ 




^nlFf^flff 1 " 



H?u-3^£^l 



f— 3j|-< 



6 "' 13" 
o'-5_ . 



Amps. 


Volts 


Form 


Fig. 


Amps. 


Volts 


Form 


Fig. 


3-15 


50-220 


J-l or 2 


1 


3-15 


500-600 


J-l or 2 


2 



*If used with Current Transformers the leads marked "a" are for the 
Potential Circuit. 

** Indicates space necessary to remove cover. 

104 



DIMENSIONS OF FRONT CONNECTED TWO -WIRE 
T t R, WATTMETERS 

25-50 AMPS. 50 TO 600 VOLTS 
FORMS D J AND D-2 




Amps. 


Volts 


Form 


Fig. 


25-50 
*25-50 
25-50 


50-220 
50-600 
50-600 


D-l or 2 

* <; 
it 


1 
1 
2 



* Special Finish— 500-volt Meter has separate resistance. 
** Indicates space necessary to remove cover. 

105 



DIMENSIONS OF FRONT CONNECTED TWO -WIRE 
T. R* WATTMETERS 

75 AMPS. 50 TO 600 VOLTS 
FORMS D-J AND D-2 



Tifc 




r\%z 



Amps. 


Volts 


Form 


Fig. 


75 

75 
*75 


50-220 
550-600 
50-600 


D-l or 2 


1 
2 
1 



*Special Finish— 550-600 volt Meter has separate resistance. 
**Indicates space necessary to remove cover. 
***Used only on 550 volt Special Finish Meter. 

106 



DIMENSIONS OF FRONT CONNECTED TWO -WIRE 
T. R. WATTMETERS 

100 TO J50 AMPS. 50 TO 600 VOLTS 
FORMS D-J AND D-2 



-,o.i 













^tioie- -^ 



W- 1 






I 615** 

1* 1 , 



e"fe 



I 






^.2. 



%tiQje___ 



m 



Ufe:3L[ i 



JfcHoJe_ 



L_ 

j 6fe** 

T I 

10^' i 

I 




7 

I 
I 






HlV 






Amps. 


Volts 


Form 


Fig. 


100-150 

100-150 

*100-150 


50-220 
550-600 
50-600 


D-l or 2 


1 
2 

1 



* Special Finish— 500-600 volt Meter has separate resistance. 
** Indicates space necessary to remove cover. 
*** Used only on 500 volt Special Finish Meter. 

107 



DIMENSIONS 



OF FRONT CONNECTED TWO-WIRE 
T, R, WATTMETERS 

200-300 AMPS, 50-600 VOLTS 
FORMS D-l AND D-2 




Amps. 


Volts 


Form 


Fig. 


Amps. 


Volts 


Form 


Fig. 


200-300 


50-600 


D-l or 2 


1 


*200-300 


50-600 


D-l or 2 


2 



* Special Finish has separate resistance. 
** Indicates space necessary to remove cover. 
***Used on all Special Finish Meters. 

108 



DIMENSIONS OF FRONT CONNECTED TWO-WIRE 
T. R* WATTMETERS 

450 AMPS, 50-600 VOLTS 
FORMS D-J AND D-2 







Amps. 


Volts 


Form Fig. 


450 

*450 


50-600 
50-600 


D-l or 2 1 
D-l or 2 2 



* Special Finish has separate resistance. 
** Indicates space necessary to remove cover. 
*** Used on all Special Finish Meters. 

109 



DIMENSIONS OF FRONT CONNECTED TWO-WIRE 
T, R, WATTMETERS 

600 AMPS, 50-600 VOLTS 
FORMS D-J AND D-2 




»i5^«j«- 



Amps. 


Volts 


Form 


Fig. 


600 
*600 


50-600 
50-600 


D-1 or 2 
D-1 or 2 


1 
2 



* Special Finish has separate resistance. 
** Indicates space necessary to remove cover. 
*** Used on all Special Finish Meters. 

110 



DIMENSIONS OF FRONT CONNECTED TWO -WIRE 
T. R. WATTMETERS 

J 200 AMPS, 50-600 VOLTS 
FORMS D-J AND D-2 



Fi<3. I 








m ml 

I 7£ -H 



17" 
1 

1 
1 

I 

1 


k 




_ «5 



Amps. 


Volts 


Form 


Fig. 


1200 
**1200 


50-600 
50-600 


D-l or 2 
D-l or 2 


1 
2 



* Indicates space necessary to remove cover. 
** Special finish has separate resistance. 

Ill 



DIMENSIONS OF FRONT CONNECTED THREE -WIRE 
T* R, WATTMETERS 

Sh-75 AMPS. 200-220 VOLTS 
FORMS J-\ t ]-2 t D-J AND D-2 




---10"% 1 






Amps. 


Volts 


Form 


Fig, 


15-75 


200-220 
200-220 


J-1 or 2 
D-1 or 2 


1 
2 



* Indicates space necessary to remove cover. 

112 



DIMENSIONS OF FRONT CONNECTED THREE-WIRE 
T. R, WATTMETERS 

J 00-300 AMPS. 200-220 VOLTS 
FORMS D-J AND D-2 




HHQle^^ 



Amps. 


Volts 


Form 


Fig. 


100-150 
200-300 


200-449 
200-600 


D-1 or 2 
D-1 or 2 


1 
2 



* Indicates space necessary to remove cover. 
113 



DIMENSIONS OF BACK CONNECTED TWO -WIRE 
T. R, WATTMETERS 

3 TO 50 AMPS, 50-600 VOLTS 
FORMS J-J, J-2, D-J AND D-2 







Amps. 


Volts 


Form 


Fig. 


3-10 
*15 
15-50 


50-600 


J-1 or 2 

J-1 
D-1 or 2 


1 
1 
2 



* Applies to J-1, No. 3 (Japan) finish only. 
** Indicates space necessary to remove cover. 

114 



DIMENSIONS OF BACK CONNECTED TWO -WIRE 
T, R, WATTMETERS 

75-300 AMPS, 50-600 VOLTS 
FORMS D-J AND D-2 







i^tAid/' 



id/ & 



— ag: 1 



Amps. 


Volts 


Form 


Fig. 


75-150 
200-300 


50-600 
50-600 


D-1 or 2 
D-1 or 2 


1 

2 



** Indicates space necessary to remove cover. 
115 



DIMENSIONS OF BACK CONNECTED TWO-WIRE 
T. R, WATTMETERS 

450-600 AMPS. 50-600 VOLTS 
FORMS D-J AND D-2 




Fi£ I 



fctdsL* 



A^t^d. 



ri£.2 



iltioL^ L 



4.«2.wd 



Amps. 


Volts 


Form 


Fig. 


450 
600 


50-600 


D-l or 2 


1 
2 



** Indicates space necessary to remove cover. 

116 



DIMENSIONS OF BACK CONNECTED 
T, R, WATTMETERS 

J200 AMPS. 50-600 VOLTS 
FORMS D-J AND D-2 



8'hoi«_, 






4§fcys*.M— r^ g 




fc^SM *■ 






Amps. 


Volts 


Form 






1200 


50-600 


D-l or 2 





* Indicates space necessary to remove cover. 



117 



DIMENSIONS OF BACK CONNECTED THREE -WIRE 
T, R* WATTMETERS 

3^-50 AMPS, 200-220 VOLTS 
FORMS J- J, J-2, D-\ AND D-2 



rio.i. 



ll't^'e. 




■ L Q $ 1 



A'suad__y 



7tTP #"> ^tt t - if-r ft" WwUwHtJiww 

^r' r<-i J J J J J il 1 - t;. 1 - a - - y- 

,1/^ilTitititititi.li £ k 







Amps. 


Volts 


Form 


Fig. 


3£-7£ 
15-50 


200-220 
200-220 


J-1 or 2 
D-1 or 2 


1 
2 



* Indicates space necessary to remove cover. 

118 



DIMENSIONS OF BACK CONNECTED THREE-WIRE 
T. R, WATTMETERS 

75-300 AMPS. 200-220 VOLTS 
FORMS D-1 AND D-2 



Fi^l 



^Q'e. 




^tudy I ,0% 1 N^ 



6V 




%^Uad/ i I 9% A i ^St-ud 

| 10 ^ 1 



Amps. 


Volts 


Form 


Fig. 


75-150 
200-300 


200-220 
200-220 


D-1 or 2 
D-1 or 2 


1 
2 



* Indicates space necessary to remove cover. 
119 



DIMENSIONS OF FRONT CONNECTED STATION 
ARC METERS 

6.6-9.6 AMPS, 1750-6250 VOLTS 

r ---»-^« T — r — J 




%H_Q\e^ 



III \A%--—* 

1^ t»J 

I- 17£ - 



»**8 J 




FJ0.-2 



IK Hi" IJ 






Volts 


Fig. 


No. Used 


1750 


2 


1 


2500 


1 


1 


3250 


1 


1 


4000 


2 


2 


5000 


1 


2 


6250 


1 


2 



* Indicates space necessary to remove cover. 

120 



DIMENSIONS OF BACK CONNECTED STATION ARC 
METERS WITH RESISTANCE BOXES 

6.6-9,6 AMPS. J 750-6250 VOLTS 



4^-bud, 




10%' 1 & 



.1 tig- 




Fig.l 



Fig,. Q. 



II U— e-J , 
IIUho^ II 

^ '_± 1 






Volts 


Fig. 


No. Used 


1750 


2 


1 


2500 


1 


1 


3250 


1 


1 


4000 


2 


2 


5000 


1 


2 


6250 


1 


2 



* Indicates space necessary to remove cover. 

121 



DIMENSIONS OF CEILING BOARD ARC METERS 

6.6-9,6 AMPS, 200-400 VOLTS 



idote 




* Indicates space necessary to remove cover. 



122 



DIMENSIONS OF TWO -WIRE HIGH CAPACITY 
T, R, WATTMETERS 

800-1500 AMPS, 50-600 VOLTS 
FORM GG-3 



r y -an 



| l2.Threads 
ia5' Per- Inch. 






K> 



I— d 



.1 ■ ~ "1 



nj! ► 



5a i 



ifipH 



^T^ 



h~€ 



Drilling in 
Swi-bohlooarcl 



^I'SfJUl 



_£ 

— i— 
.i-i 




H2l^ e>l 



i 



i 



i 




i 

i 
I 

¥ 

i 





STUDS 


CLAMPING NUTS 


CONTACT NUTS 


Amps. 


a 


b 


c 


d 


e 


f 


g 


No. Used 
per Stud 


e 


f 


g 


No. Used 
per Stud 


800 


li- 


1 " 


IF 


4*" 


2x 3 B " 


017" 
^32 


3" 
T 


1 


2ft" 


2M" 


1" 


1 


1200 


lf" 


H" 


ir 


5h" 


2|" 


Q 3 " 
<JI6 


I" 


1 


2i « 


3ft" 


1" 


•> 


1500 


H" 


I*" 


«- 


5§" 


2|" 


W 


1" 


1 


2 J" 


3ft" 


1" 


2 



123 



DIMENSIONS OF TWO-WIRE HIGH CAPACITY 
T. R, WATTMETERS 

2000-6000 AMPS. 50-600 VOLTS 
FORM GG-4 



Eg 



rff 




s 


EThread« 
Per\B-ich> 


- 


ym 


1 

b 
t 


—Iff 

1 c— 




, 





h-f-i f»i- 




•d 



* -d 



r.^.a 





STUDS 


NUTS 


Amps. 




















a 


b 


c 


Fig. 


d 


e 


f 


No.Used 
per Stud 


2000 


17" 
X 8 


If 


6" 


1 


1" 


3 " 


97" 
^16 


3 


3000 


2|" 


2 " 


7" 


1 


1" 


3r 


4iV 


4 


4000 


2|" 


21" 


7" 


1 


1" 


31" 


41" 


4 


6000 


3§" 


3f" 


10" 


2 


1" 


4|" 


5 " 


6 



134 



DIMENSIONS OF TWO -WIRE HIGH CAPACITY 
T. R, WATTMETERS 

8000-J0000 AMPS, 50-600 VOLTS 
FORM GG-4 




-d 





STUDS 


NUTS 


Amps. 


a 


b 


c 


d 


e 


f 


No. Used 
per Stud 


8000 
10000 


4|" 
4|" 


4 " 
4|" 


14 " 


1" 

1" 


5|" 
6 " 


512" 
6|" 


7 
9 



125 



DIMENSIONS OF THREE -WIRE HIGH CAPACITY 
T. R, WATTMETERS 

80CM500 AMPS, 200-220 VOLTS 
FORM GG-3 

*\zlr-- -it 

iT t 

| l2Th reads z." J l. 
Per- inch ' a I ' 




■ --114* — - 



■+- 1 -f 



^ 






PrHlii 
Switch 



k 5, ,1 

Prilling in 
Switchboard 



I 



j wmyf 



he 



*ia-!6Thr-eads 




I 



1 

5£ 



4 I8|' 



I 

I 
















,v 
















STUDS 


CLAMPING NUTS 


CONTACT NUTS 


Amps. 


a 


b 


c 


d 


e 


f 


g 


No. Used 
per Stud 


e 


f 


g 


No. Used 
per Studs 


800 


li" 


1 " 


li" 


4k" 


2ft" 


Ol 7" 
^32 


1" 


1 


2 T y 


017" 
•<%2~ 


1" 


1 


1200 


If" 


li" 


if" 


5h" 


2|" 


O 3 » 


!" 


1 


2|" 


3ft" 


1" 


2 


1500 


If" 


W 


l!" 


5h" 


2|" 


Q_3_" 
°16 


1" 


1 


n3'/ 


3ft w 


1" 


2 



136 



DIMENSIONS OF THREE-WIRE HIGH CAPACITY 
T, R. WATTMETERS 

2000-6000 AMPS. 200-220 VOLTS 
FORM GG-4 



-W-* ,2 i 



rtefrfr 



zi" 



|-r1&- 
I . I 1 - 

Dr/Z/i/jg /n 
Swtchboorc/ 

2000-4QOO/1™p 




***: 






FtqZ 



< 







STUDS 








NUTS 




Amps. 


















a 


b 


c 


Fig. 


d 


e 


f 


Xo. Used 
per Stud 


2000 


11" 


J3" 


6" 


1 


1" 


3 " 


O 7 " 


3 


3000 


2§" 


2 " ' 


7" 


1 


1" 


H" 


**" 


4 


4000 


2|" 


2|" 


7" 


1 


1" 


31" 


**" 


4 


eooo 


3|" 


3|" | 


10" 


2 


1" 


4f" 


5 " 


6 



137 



DIMENSIONS OF CASE CONTAINING CLOCK MECHAN- 
ISM FOR SINGLE DIAL TWO-RATE METERS. 
PENDULUM CLOCK 




138 



DIMENSIONS OF DOUBLE-PAWL PREPAYMENT 
ATTACHMENT FOR THOMSON RECORD- 
ING WATTMETER 




5 to 25 Amperes, 50 to 110 Volts, Two-wire. 
5 to 15 Amperes, 200 to 220 Volts, Two-wire. 
3* to 15 Amperes, 200 to 220 Volts, Three-wire. 



129 



DIMENSIONS OF WATTMETER FOR RAILWAY USE 

25 TO 200 AMPS. 
500-600 VOLTS 




SC 



Fitf^ 



4. 



b— aa'-H-a- 



®r 



■'a r^r 



€- 

I 
6' 



'I 



t-^ 



« 



DIMENSIONS NOT GIVEN, SAME AS FIG. \ 



Amps. 


Volts 


Fig. 


25-50 
100-200 


500-600 
500-600 


. 1 
2 



130 



DIMENSIONS OF FORM 2 RESISTANCE AND REAC- 
TIVE COIL BOXES FOR INDUCTION, POLYPHASE 
AND T. R. WATTMETERS 







Fig. 1 



*Lead Holes 



T. R. Wattmeters 

Induction Meters 

Polyphase, 3-wire. 2 and 3-phase 

" 4 " 2-phase Primary . 

" 4 " 2-phase Secondary 



A-E 

A-E 

A-C-E 

A-C-E 

A-E-F-J 



* |" Holes, to be drilled only when it is necessary to carry the leads through 
the switchboard. 



131 



DIMENSIONS OF 25-125 CYCLES FRONT CONNECTED 
TWO-WIRE SINGLE-PHASE INDUCTION METERS 

3- J 50 AMPS, \ 00-220 VOLTS 



T^i 



!S J " 



LDrill 




jf Drill 



Fio.a. 







Jr---JL_~ 






Hi 
s£-H 




Amps. 


Volts 


Fig. 


3-25 
50-150 


100-220 
100-220 


t 
2 



132 



DIMENSIONS OF 25-125 CYCLES ROUND PATTERN 
BACK CONNECTED PRIMARY SINGLE- 
PHASE INDUCTION METERS 

3-J50 AMPS. U00-2200 VOLTS 




Amps. 


Volts Fig. 


3- 25 
50-150 


1100-2200 
1100-2200 


1 
2 



133 



DIMENSIONS OF 25425 CYCLE FRONT CONNECTED 
THREE -WIRE SINGLE-PHASE INDUCTION METERS 

3£- J 50 AMPS. 200-220 VOLTS 
FORM C-4 



&9rA 



Fig, I. 

S"Dri'il 







*TP"-->,laf--" E ii 
•--si 1 



U& 



L__ 6 |-. 



£5C'!ii 




Amps. 


Volts 


Fig. 


3|- 25 
50 -150 


200-220 
200-220 


1 
2 



134 



DIMENSIONS OF 40 CYCLES AND OVER HIGH TORQUE 
2 AND 3-WIRE INDUCTION METERS 

3- J 50 AMPS, 

|_Holc 



n<gi 



d£Hoie_ 




1M--7A— Mi sf 



Pig; 




Ji ft ji ij jp ! ■ 




Amps. 


Volts 


Type 


Fig. 


3 -150 
3J- 75 


100-220 
100-220 


2-Wire 
3-Wire 


1 
2 



Dimensions not given same as Fig. 1. 
♦Used only on meters supplied with transformers. 



135 



DIMENSIONS OF 25-125 CYCLE FRONT CONNECTED 
RECTANGULAR PATTERN POLYPHASE INDUC- 
TION METERS 

3 TO 150 AMPS, 




rig, I 



t'Koj© _s' l^X — 9 £- 3% 




S 



For all primary circuits,, requires Qcurrent &r~\d Q. 
potentia I t-ranaformers, and * 

For- all secondary circuits exceeding ISOAmpa 
requires. Q. current transformers. 



For secondary 4. wire Q phase circuits of all 
Frequencies, and 

For 2o cycle' secondary -3 phase-3wire 2pha.se and 
monocyclic circuits. 



For secondary 3 phase- 3 wire 2 phase and monocyclic 
Circuits nf C50 cy c ' es and over 



Amps. 



Fig. 



3- 75 

100-150 



136 



DIMENSIONS OF 25425 CYCLE ROUND PATTERN BACK 
CONNECTED POLYPHASE METERS 

3- J 50 AMPS. 




->^£k$2iV .V 



DIMENSIONS 


Capacity 


a 


b 


c 


d 


e 


f 


3 to 25 
50 to 150 


1" 

5" 


3" 






r 

r 


i" 



137 



SYMBOLS USED WITH THOMSON WATTMETERS 




Round Pattern 
Polyphase Meter 




□ 



Round Pattern 
S/nq/e-Phase 
/nduct/on Met er Rectanqu/ar Pattern 
Po/yphase Meter 




Thomson 

S/nq/e-Phase 

/nduct/on Meter 



Shunt 
r/e/d 



Commutator 



A 



V 



TR. Wattmeter 
/v'e/C Coi/s 




Miqh Torque 
/nduct/on Meter 



/Laq Co// 



--EZBSZS-- 



-AAMAAMA^ 



ReactiVe Co// Res/stance in Meter 



/n Separate Box 



or Extension 



4— f 



Potent/a/ 
Transformer 



Et 



-wwv— 



Res /stance in 
Separate Qox 



138 



CONNECTIONS 

OF 

THOMSON RECORDING 
WATTMETERS 



CONNECTIONS 

On page 138 are given the diagrammatic symbols as used with diagrams and 
which will be found useful in interpreting connections. 

THOMSON RECORDING WATTMETERS 

(COMMUTATING TYPE) 
FORMS y\ AND J-2; D-J AND D-2 

FRONT CONNECTED, 2-WIRE, SECONDARY CIRCUITS 



Amp. Capacity 



3 to 50 

75 to 600 

1200 



Transformers 



None 



Current 



Page 



145 
146 
147 

148 



BACK CONNECTED, 2-WIRE, SECONDARY 


CIRCUITS 


3 to 600 
1200 


None 
Current 


149 
150 
151 


FRONT CONNECTED, 3-WIRE SECONDARY 


CIRCUITS, 


2>\ to 150 
200 to 300 


None 
it 


152 
153 


BACK CONNECTED, 3-WIRE, SECONDARY 


CIRCUITS 


3| to 150 

200 to 300 


None 


154 
155 


FRONT CONNECTED, PRIMARY CIRCUITS 


3 to 600 


Potential 
Current and Potential 


156 

157 


BACK CONNECTED, PRIMARY CIRCUITS 


Amp. Capacity 


Transformers 


Page 


3 to 600 


Potential 
Current and Potential 


158 
159 



140 



CONNECTIONS OF 
HIGH CAPACITY G-2, GG-3 AND GG-4 DIRECT CUR- 
RENT ASTATIC WATTMETERS 



Amp. Capacity 


Form 


Wire 


Page 


800- 1500 


GG-3 


2 


160 


2500-10000 


G-2 


2 


161 


2000-10000 


GG-4 


2 


162 


800- 1500 


GG-3 


3 


163 


2000- 6000 


GG-4 


3 


164 



ARC CIRCUIT METERS 



Page 



Station Type, Front Connected 
Station Type, Back Connected . 
Ceilingboard Type 



165 
165 
166 



MISCELLANEOUS METERS 



Railway . 

Prepayment (2- wire) 
Prepayment (3-wire) 
Two- Rate (2-wire) 
Two-Rate (3-wire) 
Portable . 



Page 



167 
168 
169 
170 
171 
172 



141 



CONNECTIONS OF 

THOMSON SINGLE-PHASE FORM C-4 AND ROUND 

PATTERN INDUCTION METERS 

FRONT CONNECTED, 2-WIRE SECONDARY CIRCUITS 



Frequency 


Transformers 


Page 


25- 40 Cycles 
25- 40 
60-125 " 
60-125 " 


None 
Current 

None 
Current 


173 Fig. 1 

173 Fig. 2 

174 Fig. 1 
174 Fig. 2 



BACK CONNECTED, 2-WIRE SECONDARY CIRCUITS 



25- 40 Cycles 


None 


175 


25- 40 


Current 


176 


60-125 


None 


177 


60-125 " 


Current 


178 



FRONT CONNECTED, 3-WIRE SECONDARY CIRCUITS 



25- 40 Cycles 
60 125 " 




179 Fig. 1 
179 Fig. 2 



FRONT CONNECTED, PRIMARY CIRCUITS 



25- 40 Cycles 
25- 40 
60-125 
60-125 " 



Potential 
Potential and Current 

Potential 
Potential and Current 



173 Fig. 3 

173 Fig. 4 

174 Fig. 3 
174 Fig. 4 



BACK CONNECTED, PRIMARY CIRCUITS 



25- 40 Cycles 


Potential 


180 


25- 40 " 


Potential and Current 


181 


60-125 " 


Potential 


182 


60-125 " 


Potential and Current 


183 



143 



CONNECTIONS OF 
HIGH TORQUE INDUCTION METERS 

FRONT CONNECTED, 2-WIRE SECONDARY CIRCUITS 



Frequency 


Transformers 


Page 


40-125 Cycles 
40-125 " 


None 
Current 


184 Fig. 1 
184 Fig. 2 


FRONT CONNECTED, 3-WIRE SECONDARY CIRCUITS 


40-125 Cycles 


None 


185 


FRONT CONNECTED, PRIMARY CIRCUITS 


40-125 Cycles 
40-125 " 


Potential 
Potential and Current 


184 Fig. 3 
184 Fig. 4 



POLYPHASE METERS 

On pages 186-188 will be found internal connection diagrams of rectangular 
and round pattern Meters. 



143 



CONNECTIONS OF 
THOMSON POLYPHASE METERS 

FOR 3-WIRE, TWO AND THREE-PHASE AND 

MONOCYCLIC CIRCUITS 

RECTANGULAR PATTERN, FRONT CONNECTED 



Frequency 


Transformers 


Page 


25 Cycles 

25 

25 

30-125 " 

30-125 " 

30-125 " 


None 

Current 

Current and Potential 

None 

Current 

Current and Potential 


189 
190 
191 
192 
193 
194 



ROUND PATTERN, BACK CONNECTED 



25 Cycles 


None 


195 


25 


Current 


196 


25 


Current and Potential 


197 


30-125 " 


None 


198 


30-125 " 


Current 


199 


30-125 " 


Current and Potential 


200 



4-WIRE, TWO-PHASE CIRCUITS 
RECTANGULAR PATTERN, FRONT CONNECTED 



25 Cycles 


None 


201 


25 


Current 


202 


25 


Current and Potential 


203 


30-125 " 


None 


204 


30-125 " 


Current 


205 


30-125 " 


Current and Potential 


206 



ROUND PATTERN, BACK CONNECTED 



25 Cycles 


None 


207 


25 


Current 


208 


25 


Current and Potential 


209 


30-125 " 


None 


210 


30-125 k< 


Current 


211 


30-125 " 


Current and Potential 


212 



144 



CONNECTIONS OF FRONT CONNECTED TWO -WIRE 
T, R, WATTMETERS 

3-50 AMPS. 50-600 VOLTS 
FORMS J-J, J-2, D-J AND D-2 



^ 



o 



ffl 



-wvwvwwv 1 



Line 



Load 



14c 



CONNECTIONS OF FRONT CONNECTED TWO -WIRE 
T, R. WATTMETERS 

75-600 AMPS. 50-600 VOLTS 
FORMS D-J AND D-2 




146 



CONNECTIONS OF FRONT CONNECTED TWO-WIRE 
T. R. WATTMETERS 

J 200 AMPS. 50-600 VOLTS 
FORMS D-J AND D-2 




147 



CONNECTIONS OF FRONT CONNECTED T, R, 
WATTMETERS WITH CURRENT TRANS- 
FORMER FOR SECONDARY CIRCUITS 

50-600 VOLTS 
TYPE CF, FORMS J-J OR 2 AND D-J OR 2 




a. jmi .ftA«y 



>rti!i 



^wwwwww- 



¥ 




ex. 



Une 



r-^L 



Load 



148 



CONNECTIONS OF BACK CONNECTED TWO -WIRE 
T. R. WATTMETERS 

3-600 AMPS, 50-600 VOLTS 
FORMS J- J, J-2, D-J AND D-2 




Connections as seen from front of board. 



149 



CONNECTIONS OF BACK CONNECTED TWO-WIRE 
T, R. WATTMETERS 

J 200 AMPS, 50-600 VOLTS 
FORM D-J OR D-2 



Line 



MfhWrrrrm 



pill. 



Load 



Connections as seen from front of board. 



150 



CONNECTIONS OF BACK CONNECTED TWO-WIRE T. R 

WATTMETERS WITH CURRENT TRANSFORMER 

FOR SECONDARY CIRCUITS 

50-600 VOLTS 
FORMS J- J, J-2, D-l AND D-2 




Connections as seen from front of board. 



151 



CONNECTIONS OF FRONT CONNECTED THREE -WIRE 
T, R. WATTMETERS 

3£- J 50 AMPS. 200-220 VOLTS 
FORMS J-J, J-2, D-i AND D-2 




152 



CONNECTIONS OF FRONT CONNECTED THREE -WIRE 
T. R. WATTMETERS 

200 AND 300 AMPS, 200-220 VOLTS 
FORMS D-J AND D-2 



T T 




oad 



Pleurt^r-al 



$ *- 



1S3 



CONNECTIONS OF BACK CONNECTED THREE -WIRE 
T. R, WATTMETERS 

3h-l50 AMPS. 200-220 VOLTS 
FORMS J- J, J-2, D-X AND D2 



L/me 




m 



j— WWW— | 



neutral 



JLoad 



Connections as seen from front of board. 



154 



CONNECTIONS OF BACK CONNECTED THREE -WIRE 
T. R, WATTMETERS 

200 AND 300 AMPS, 200-220 VOLTS 
FORMS D-J AND D-2 




¥ 



f\ 



T T 

Line | L 






ja a 



is — sr 



Neutral^ 



c \ 



JLoad 



Connections as seen from front of board. 



155 



CONNECTIONS OF FRONT CONNECTED PRIMARY 

T. R. WATTMETERS FOR CIRCUITS NOT 

EXCEEDING 2500 VOLTS 

3-600 AMPS. 
FORMS J- J, J-2, D-J AND D-2 



ivv Uj ^ j Vr U 



-vVW\\VWWVWW\W- 



-WWWWV\^-| 



' — ^r\ 



Uine 



Load 



RT. 



156 



CONNECTIONS OF FRONT CONNECTED PRIMARY 
T. R. WATTMETERS FOR CIRCUITS EXCEED- 
ING 2500 VOLTS 

FORMS Jf-1, J-2, D-J AND D-2 



f 



r 



w 



l^u 



MWAWWWVWAWV 1 



■^WWWMA-1 



Line 



Load 



157 



CONNECTIONS OF BACK CONNECTED PRIMARY 

T. R. WATTMETERS FOR CIRCUITS NOT 

EXCEEDING 2500 VOLTS 

3-600 AMPS. 
FORMS J-J, J-2, D-I AND D-2 




Connections as seen from front of board. 



158 



CONNECTIONS OF BACK CONNECTED PRIMARY 

T. R, WATTMETERS FOR CIRCUITS 

EXCEEDING 2500 VOLTS 

FORMS J- J, J-2, D-J AND D-2 




rt__r 



-.V.'.Y.V.V.V.V.V.V.V.'- 



I 



CT. 



"l 



ww 



13 ET 



Lin© 



Connections as seen from front of board, 



159 



CONNECTIONS OF BACK CONNECTED TWO -WIRE 
HIGH CAPACITY WATTMETERS 

800- J 500 AMPS. 50-600 VOLTS 
FORM GG-3 




Connections as seen from front of board. 



160 



CONNECTIONS OF BACK CONNECTED TWO-WIRE 

HIGH CAPACITY THOMSON RECORDING 

WATTMETERS 

2500- J 0000 AMPS. 50-600 VOLTS 
FORM G-2 



+ C 



rVWWV 




m 



n 



'j^^i 




Generator 



r^/VWV 






E>m«. 



Connections as seen from front of board. 



=J 



+ 



Generator. 



161 



CONNECTIONS OF BACK CONNECTED TWO-WIRE 

HIGH CAPACITY THOMSON RECORDING 

WATTMETERS 

2000- J 0000 AMPS, 50-600 VOLTS 
FORM GG-4 

ja a 



-f / 8U3. 



Generator. 



\ V lei 



nWrl 




Load. 




Connections as seen from front of board. 

163 



CONNECTIONS OF BACK CONNECTED THREE-WIRE 

HIGH CAPACITY THOMSON RECORDING 

WATTMETERS 

800-J500 AMPS. 200-220 VOLTS 
FORM GG-3 




Connections as seen from front of board. 



163 



CONNECTIONS OF BACK CONNECTED THREE -WIRE 

HIGH CAPACITY THOMSON RECORDING 

WATTMETERS 

2000-6000 AMPS, 200-220 VOLTS 
FORM GG-4 




Connections as seen from front of board. 



Note.— Load and generator connections are interchangeable; top bus is 
always +. Leads of potential circuit, always on generator side, the leads 
of lightning arresters on the load side. If generator is on the left, the 
potential leads at the meter must be interchanged. 



164 



CONNECTIONS OF STATION ARC METERS FRONT 
AND BACK CONNECTED 

6.6-9.6 AMPS. J 750-6250 VOLTS 



External 
Resistance 



J 1 




Jgp 



EH 



l^WVWWWV- 



Line 



Load 



Connections as seen from front of board. 

Note. — On circuits of 3300 volts or over two resistance boxes are tised, 
being connected in series. 



165 



CONNECTIONS OF CEILING BOARD ARC METER 

6,6-9.6 AMPS. 200-400 VOLTS 
FORMS JM-J OR 2 



Lime. 




Lamps 



166 



CONNECTIONS OF T. R, WATTMETERS FOR RAILWAY 
SERVICE 

25-200 AMPS. 500-600 VOLTS 



To Trolley 



■vwwi 



1-6HB— ■ i 



f==^ 



r-C 



mr 



I ,, J 



yy> 



To Cor>broller- 



167 



CONNECTIONS OF TWO-WIRE T. R. WATTMETER 
WITH FORM 2 PREPAYMENT DEVICE 

3-25 AMPS. 50-JJO VOLTS 
3-15 AMPS. 200-220 VOLTS 




168 



CONNECTIONS OF THREE -WIRE T. R* WATTMETERS 
WITH FORM 2 PREPAYMENT DEVICE 

3£-J5 AMPS. 200-220 VOLTS 



fT'J 



¥ 



l mmamm/h 



5 



Line 



ft 



<S* 



JS± 



\ Load 




(vwwwwi 



•€) 



169 



CONNECTIONS OF TWO-WIRE SINGLE-DIAL TWO- 
RATE METER WITH BATTERY 
WOUND CLOCK 

3-600 AMPS. 50-600 VOLTS 



BatX-erlea, 




170 



CONNECTIONS OF THREE-WIRE SINGLE -DIAL T BO- 
RATE METER WITH BATTERY WOUND CLOCK 

3J-150 AMPS. 200-220 VOLTS 




171 



CONNECTIONS OF PORTABLE THOMSON RECORDING 
WATTMETER 



MMr- 1 




Internal Connections 



JLine 



Load 



172 



CONNECTIONS OF 25-40 CYCLE FRONT CONNECTED 
TWO -WIRE SINGLE-PHASE INDUCTION METERS 

FORM C-4 




3 to 150 Amps. 

50 to 6co Volts 

FIG. 1 




3 to 150 Amps. 

1000 to 2500 Volts 

FIG. 3 




c 




1 


\ S ' 






r 


r t » ^ 


C.T. 


React/ive 
1 pftFf 


1 



















Above 150 Amps. 

50 to 600 Volts 

FIG. 2 




Above 150 Amps and 600 Volts and 

all Amp. Capacities above 2500 Volts 

FIG. 4 



173 



CONNECTIONS OF 60 CYCLE AND OVER FRONT 

CONNECTED TWO -WIRE SINGLE-PHASE 

INDUCTION METERS 

FORM C-4 




Line 




Line 



Load 



3 to 150 Amp. 

50 to 600 Volts. 

FIG. 1 



3 to 150 Amp. 

Above 600 Volts. 

FIG. 3 









I 




_J 


c 




J 






C.T. 




1- 














Line 




Load 



Line 



i 



Above 150 Amp. 

50 to 600 Volts. 

FIG. 2 



Above 150 Amps, and 600 Volts 
and all Amp. Capacities 
above 2500 Volts. 
FIG. 4 



174 



CONNECTIONS OF 25-40 CYCLE BACK CONNECTED 
SINGLE-PHASE INDUCTION METER 

3-150 AMPS. 50-600 VOLTS 




Connections as seen from front of board. 



175 



CONNECTIONS OF 25-40 CYCLE BACK CONNECTED 

ROUND PATTERN SINGLE-PHASE 

INDUCTION METER 

ABOVE 150 AMPS. 50-600 VOLTS 




Connections as seen from front of board. 



176 



CONNECTIONS OF 60 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN SINGLE-PHASE 
INDUCTION METER 

3-J50 AMPS, 50-600 VOLTS 




Connections as seen from front of board. 



177 



CONNECTIONS OF 60 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN SINGLE-PHASE 
INDUCTION METER 

ABOVE 150 AMPS, 50-600 VOLTS 




Connections as seen from front of board. 



178 



CONNECTIONS OF FRONT CONNECTED THREE -WIRE 
SINGLE-PHASE INDUCTION METERS 

FORM C-4. 200-220 VOLTS 



Uhne 




Line 








Load 


[3 


tu2 


i 

eCoii. 


r> 



















25-40 CYCLES. FIG. J 




Load 



60 CYCLES AND ABOVE. FIG. 2 



179 



CONNECTIONS OF 25-40 CYCLE BACK CONNECTED 
SINGLE-PHASE INDUCTION METER 

3-J50 AMPS, JOOO-2500 VOLTS 




Connections as seen from front of board. 



180 



CONNECTIONS OF 25-40 CYCLE BACK CONNECTED 

ROUND PATTERN SINGLE-PHASE 

INDUCTION METER 

ABOVE J 50 AMPS. AND 600 VOLTS AND ALL AMPERE 
CAPACITIES ABOVE 2500 VOLTS 




Connections as seen from front of board. 



181 



CONNECTIONS OF 60 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN SINGLE-PHASE 
INDUCTION METER 

3- J 50 AMPS. 1000-2500 VOLTS 




Connections as seen from front of board. 



183 



CONNECTIONS OF 60 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN SINGLE-PHASE 
INDUCTION METER 

ABOVE J 50 AMPS. AND 600 VOLTS AND ALL AMPERE 
CAPACITIES ABOVE 2500 VOLTS 




Connections as seen from front of board. 



183 



CONNECTIONS OF FRONT CONNECTED HIGH TORQUE 

TWO-WIRE SINGLE-PHASE INDUCTION METERS 

FOR 40 CYCLES AND OVER 



Line 



r&\ 



a 



D 



p 



Load Line 




=o=F 



±± 



3 to 150 Amps. 
50 to 600 Volts 

FIG. 1 



3 to 150 Amps. 
Above 600 Volts 

FIG. 3 



4 



a 



D 



F=3 



Line 







Above 150 Amps. 
50 to 600 Volts 

FIGS. 2 



Load 




D 



f4 



CT. 







Line 



a 



Load 



Above 150 Amps, and 600 Volts and 
all Amp. capacities above 2500 volts 

FIGS. 4 



184 



CONNECTIONS OF FRONT CONNECTED HIGH TORQUE 

THREE -WIRE SINGLE-PHASE INDUCTION METERS 

FOR 40 CYCLES AND OVER 

200-220 VOLTS 





€ 




( 




1 


2) 






D 
























Line 








Load 



























185 



INTERNAL CONNECTIONS OF RECTANGULAR PAT- 
TERN POLYPHASE METER FOR 3-WIRE 2 AND 
3-PHASE, 4-WIRE 2-PHASE, AND MONOCYCLIC 
CIRCUITS WITHOUT TRANSFORMERS 




For 3-phase, 3-wire, 2-phase and monocyclic circuits of 30 cycles and over 
omit "B." For these circuits of 25 cycles and for all 4- wire, 2-phase circuits 
connect Lead "A" to it. 

Arrow indicates direction of winding from starting lead. 



186 



INTERNAL CONNECTIONS OF RECTANGULAR PAT- 
TERN POLYPHASE METER FOR 3- WIRE 2 AND 
3-PHASE, 4-WIRE 2-PHASE, AND MONOCYCLIC 
CIRCUITS WITH TRANSFORMERS 




Arrow indicates direction of winding from starting lead. 



187 



INTERNAL CONNECTIONS OF ROUND PATTERN 

POLYPHASE METER FOR 3-WIRE 2 AND 

3-PHASE, 4-WIRE 2-PHASE, AND 

MONOCYCLIC CIRCUITS 




Arrow indicates direction of winding from starting lead. 



188 



CONNECTIONS OF 25 CYCLE FRONT CONNECTED 
RECTANGULAR POLYPHASE METER FOR 3-WIRE 
2 AND 3-PHASE AND MONOCYCLIC SECOND- 
ARY CIRCUITS 

3- J 50 AMPS, 50-600 VOLTS 




On Monocyclic Circuits the wire marked A is the teaser. 



189 



CONNECTIONS OF 25 CYCLE FRONT CONNECTED 
RECTANGULAR POLYPHASE METER FOR 
3-WIRE 2 AND 3-PHASE AND MONO- 
CYCLIC SECONDARY CIRCUITS 

ABOVE J50 AMPS. 50-600 VOLTS 



Line 



?q 



□ 



C T Load 



CT 



On Monocyclic Circuits the wire marked A is the teaser. 



190 



CONNECTIONS OF 25 CYCLE FRONT CONNECTED 
RECTANGULAR POLYPHASE METER FOR 
3 -WIRE 2 AND 3-PHASE AND MONO- 
CYCLIC PRIMARY CIRCUITS 

ALL CAPACITIES ABOVE 600 VOLTS 



>T 



3—S- 



■M^ 



< < i r ~* ~> f t f 



□ 



4-4 



4-4 



C.T. Load 



On Monocyclic Circuits the wire marked A is the teaser. 



191 



CONNECTIONS OF 30 CYCLE AND OVER FRONT CON- 

NECTED RECTANGULAR POLYPHASE METER 

FOR 3-WIRE 2 AND 3-PHASE ANDIMONO- 

CYCLIC SECONDARY CIRCUITS 

3-J50 AMPS. 50-600 VOLTS 





□ 












" 








JLine 




Load 


-X 

















On Monocyclic circuits the wire marked A is the teaser. 



193 



CONNECTIONS OF 30 CYCLE AND OVER FRONT CON- 
NECTED RECTANGULAR POLYPHASE METER 
FOR 3 -WIRE 2 AND 3-PHASE AND MONO- 
CYCLIC SECONDARY CIRCUITS 

ABOVE 150 AMPS, 50-600 VOLTS 



-A 



□ 



C.T. Load 



C.T. 



On Monocyclic Circuits the wire marked A is the teaser. 



193 



CONNECTIONS OF 30 CYCLE AND OVER FRONT CON- 
NECTED RECTANGULAR POLYPHASE METER 
FOR 3 -WIRE 2 AND 3-PHASE AND MONO- 
CYCLIC PRIMARY CIRCUITS 

ALL CAPACITIES ABOVE 600 VOLTS 



u 



-A 



6 6 

P.T. 



□ 



Loaa 



OnlMonocyclic Circuits the wire marked A is the teaser. 



194 



CONNECTIONS OF 25 CYCLE BACK CONNECTED 
ROUND PATTERN POLYPHASE METER FOR 
3-WIRE 2 AND 3-PHASE AND MONO- 
CYCLIC SECONDARY CIRCUITS 

3-150 AMPS. 50-600 VOLTS 




Connections as seen from front of board. 

On Monocyclic Circuits the wire marked A is the teaser. 



195 



CONNECTIONS OF 25 CYCLE BACK CONNECTED 
ROUND PATTERN POLYPHASE METER FOR 
3-WIRE 2 AND 3-PHASE AND MONO- 
CYCLIC SECONDARY CIRCUITS 

ABOVE \ 50 AMPS. 50-600 VOLTS 




Connections as seen from front of board. 

On Monocyclic Circuits the wire marked A is the teaser. 



196 



CONNECTIONS OF 25 CYCLE BACK CONNECTED 
ROUND PATTERN POLYPHASE METER FOR 
3 -WIRE 2 AND 3-PHASE AND MONO- 
CYCLIC CIRCUITS 

ALL CAPACITIES ABOVE 600 VOLTS 




Connections as seen from front of board. 

On Monocyclic Circuits the wire marked A is the teaser. 



197 



CONNECTIONS OF 30 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN POLYPHASE METER 
FOR 3-WIRE 2 AND 3-PHASE AND MONO- 
. CYCLIC SECONDARY CIRCUITS 

3-150 AMPS, 50-600 VOLTS . 




Connections as seen from front of board. 

On Monocyclic Circuits the wire marked A is the teaser. 



198 



CONNECTIONS OF 30 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN POLYPHASE METER 
FOR 3 -WIRE 2 AND 3-PHASE AND MONO- 
CYCLIC SECONDARY CIRCUITS 

ABOVE J50 AMPS. 50-600 VOLTS 



Line 




Load 



Connections as seen from front of board. 

On Monocyclic Circuits the wire marked A is the teaser. 



199 



CONNECTIONS OF 30 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN POLYPHASE METER 
FOR 3-WIRE 2 AND 3-PHASE ANDl MONO- 
CYCLIC CIRCUITS 

ALL CAPACITIES ABOVE 600 VOLTS 




Connections as seen from front of board. 

On Monocyclic Circuits the wire marked A is the teaser. 



200 



CONNECTIONS OF 25 CYCLE FRONT CONNECTED 

RECTANGULAR POLYPHASE METER FOR 4 -WIRE 

2-PHASE SECONDARY CIRCUITS 

3-150 AMPS. 50-600 VOLTS 













l.JIr. 


























~CSS £/fr 




























□ 




































■™ 


















I st Phase 














Une 






i_oacA 


a nd Phase 

















201 



CONNECTIONS OF 25 CYCLE FRONT CONNECTED 

RECTANGULAR POLYPHASE METER FOR 4 -WIRE 

2-PHASE SECONDARY CIRCUITS 

ABOVE 150 AMPS. 50-600 VOLTS 















L. II R. 


















r^ 


$T£ 


h 












¥ 


Q 


























□ 




































































































C.T. 
































[sr phase 
































Line 












Load 




C.T. 


























2 nd Phase 



























202 



CONNECTIONS OF 25 CYCLE FRONT CONNECTED 

RECTANGULAR POLYPHASE METER FOR 4 -WIRE 

2-PHASE PRIMARY CIRCUITS 

ALL CAPACITIES ABOVE 600 VOLTS 




203 



CONNECTIONS OF 30 CYCLE AND OVER FRONT CON- 
NECTED RECTANGULAR POLYPHASE METER FOR 
4 -WIRE 2-PHASE SECONDARY CIRCUITS 

3-J50 AMPS. 50-600 VOLTS 











□ 
























^ " 




























■ 






l« T Phase 














JLine 






JLoakd, 


JZ™ Phase 













204 



CONNECTIONS OF 30 CYCLE AND OVER FRONT 

CONNECTED RECTANGULAR POLYPHASE 

METER FOR 4-WIRE 2-PHASE 

SECONDARY CIRCUITS 

ABOVE J50 AMPS. 50-600 VOLTS 











□ 
































1 ^ ^^^ 


"1 




































































C.T. 






















l* r Phase 
































Line 












Load 




C.T. 
























- 


;8, ncl Ph3ise 



























205 



CONNECTIONS OF 30 CYCLE AND OVER FRONT CON- 
NECTED RECTANGULAR POLYPHASE METER FOR 
4 -WIRE 2-PHASE SECONDARY CIRCUITS 

ALL CAPACITIES ABOVE 600 VOLTS 




CONNECTIONS OF 25 CYCLE BACK CONNECTED 

ROUND PATTERN POLYPHASE METER FOR 

4 -WIRE 2-PHASE SECONDARY CIRCUITS 

3-150 AMPS. 50-600 VOLTS 









L. R. 










i — dA^Vft- 














I 






























' 






« 




























I st Phase 














Une 






Load. 


2 na Phase 





Connections as seen from front of board. 



307 



CONNECTIONS OF 25 CYCLE BACK CONNECTED 

ROUND PATTERN POLYPHASE METER FOR 

4 -WIRE 2-PHASE SECONDARY CIRCUITS 

ABOVE 150 AMPS, 50-600 VOLTS 




FPhase 



JLoetdl 



2 nd 'Phase 



Connections as seen from front of board. 



208 



CONNECTIONS OF 25 CYCLE BACK CONNECTED 

ROUND PATTERN POLYPHASE METER FOR 

4 -WIRE 2-PHASE PRIMARY CIRCUITS 

ALL CAPACITIES ABOVE 600 VOLTS 




Connections as seen from front of board. 



209 



CONNECTIONS OF 30 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN POLYPHASE METER 
FOR 4 -WIRE 2-PHASE SECONDARY CIRCUITS 

3-150 AMPS, 50-600 VOLTS 





















\ 


i 

K. 1 












































1 st Phase 












Line 






Load 


£ nd Phase 









Connections as seen from front of board. 



210 



CONNECTIONS OF 30 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN POLYPHASE METER 
FOR 4-WIRE 2-PHASE SECONDARY CIRCUITS 

ABOVE J50 AMPS, 50-600 VOLTS 




JLoad 



Connections as seen from front of board. 



211 



CONNECTIONS OF 30 CYCLE AND OVER BACK CON- 
NECTED ROUND PATTERN POLYPHASE METER 
FOR 4 -WIRE 2-PHASE PRIMARY CIRCUITS 

ALL CAPACATIES ABOVE 600 VOLTS 




Connections as seen from front of board. 



312 



INDEX 



Adjustable Shunt Field Coils 

Connections 

Data on . . 

Installing 
Armatures 

Meter 

Labels and marking of 
Arc Meters 

Armature Data- on . 

Connections 

Constants of 

Comparative Speeds of 

Dimension of . 

Finish of . 



of 



Installing . 

Jewels for . 

Orders for . 

Pivots for . 

Gear Ratio for Registers 

Registers of 

Weights of 
Back Connected Meters 

Connections of 

Dimensions of . 
Brushes, Care of 
Card Resistance, 

Data on 

Envelopes for . 
Calibration, Meter . 
Capacity, Lamp, H.P. and K\v. 
Card and Tube Resistance 
Constants, Meter . 
Commutators, Care of . 
Connections 

Armatures . 

Instrument 

Meter 

Shunt Field Coil . 

Symbols for 
Comparative Speeds, Meter 
Connections, Symbols . 
Covers, Meter 
Creeping, Meter 
Cyclometer, Dials . 



Page 

24 
58 
22 

53 
54 

56 
141 
44 
52 
86 
19 
28 
26 
21 
26 
44 
34 
80 

140 

82 
28 

63 
25 
38 
76 
63 
39 
28 

53 
34 

140 
24 

139 
50 

139 
19 
30 
22 



Page 

Connections of Meters 

Thomson Recording Wattmeters 

Arc Circuit .... 141 

High Capacity . . . .141 

J-l, J-2, D-l, D-2 . . .140 

Portable 141 

Prepayment .... 141 
Railway ..... 141 

Two-Rate 141 

Thomson Single-Phase Induc- 
tion 142 

Thomson High Torque Induc- 
tion ..... 143 
Thomson Polyphase 
Internal 143 



Rectangular Pattern 




. 144r 


Round Pattern 


. 144 


Symbols .... 


. 139 


ials, Constants on Meter . 


. 41 


irect Reading, Meters which are 39- 


-1, D-2 Meters 




Adjustable Shunt Field Coils 


for ... 22 and 58- 


Armatures for 


. 53 


Brushes for 




. 2a 


Connections of 




. 140 


Constants of 




.. 41 


Comparative Speeds of 




. 50 


Creeping of 




30 


Covers for 




19 


Calibration of . 




38 


Card Resistance Data for 


63 


Card Resistance Envelope foi 


' 25 


Dimensions of 


84 


Finish of . 


19> 


Gear Ratio for Registers of 


41 


Horse-power Rating of . 


76 


Inductive Loads on 


31 


Installing .... 


28 


Jewels for . . . . 


26- 


Lagging of 


31 


Light Load Adjustments for 


29 


Lamp Ratings of 


76 


Magnets for 




6& 



213 



Page 
D-l, D-2 Meters— (Concluded) 

Non-Creeping Device for . 30 
Name-Plate Stamping of . 38 
Orders for . . . .21 

Pivots for 26 

Registers of . . .34 

Resistance for . . . .63 

Speeds of 50 

Testing of .... 33 

Total Resistance of 65 

Studs for 79 

Shunt Field Coils for . 22 and 58 
Watt Loss .... 65 
Dimensions of Meters 

Thomson Recording Wattmeters 
Arc Circuit . ... 86 
Forms Made Previous to J-l, 

J-2 82 

High Capacity . . .87 

High Torque .... 89 
J-l, 1-2, D-l, D-2 ... 84 
Prepayment .... 87 
Single-Phase Induction C-4 

and R.P 88 

Single-Phase Induction 3-wire 89 
Street Car or Railway . . 87 
Two-Rate .... 87 

Thomson Recording Poly- 
phase Rectangular Pattern 90 
Thomson Recording Poly- 
phase Round Pattern . . 90 
Envelopes, Card Resistance . . 25 

Finish, Meter 19 

Finish, Jewel Screw . . -.27 
Field Coils, Installing Shunt . 22 
Connection of Shunt. . . 24 
Data on Shunt ... 58 
Formula, Meter .... 33 
Form Letters, Meter ... 18 
Front Connected Meters, Dimen- 
sions of 82 

Front Connected Meters, Connec- 
tions of 140 

General Remarks . . 21 and 31 

Gears, Ratio of Meter Register . 41 



Page 




GG-2 Meters 

Armature Data for 

Brushes for 

Connections of 

Comparative Speeds < 

Constants of 

Creeping of 

Covers for 

Calibration of 

Finish of . 

Gear Ratio for Registers of 

Horse -Power Rating of . 

Installing .... 

Jewels for . 

Magnets for 

Non-Creeping Device for 

Name-Plate Stamping of 

Lamp Ratings of 

Orders for . 

Pivots for . 

Resistance of . 

Speeds of . 

Shunt Field Coils for 

Total Resistance of 

Testing of 

Watt Loss of . 
GG-3 Meters 

Connections of . 

Dimensions of . 

Jewels for . 

Orders for 

Name-Plate Stamping of 

Pivots for . 
GG-4 Meters 

Connections of . 

Constants of 

Covers for 

Comparative Speeds of 

Creeping of 

Calibration of . 

Dimensions of . 

Finish of . . . 

Gear Ratio for Registers < 

Horse-Power Rating of 

Installing . 



of 



214 



Page 



GG-4 Meters— (Concluded) 




Jewels for .... 


. 26 


Magnets for 


. 71 


Non-Creeping Device for 


. 30 


Xame-Plate Stamping of 


. 38 


Lamp Ratings of 


. 76 


Orders for .... 


. 21 


Pivots for .... 


26 


Speeds of 


52 


Shunt Field Coils for 


62 


Testing of . 


32 


High Torque Induction Meter 




Connections of . 


143 


Constants of 


48 


Comparative Speeds of . 


50 


Calibration of . 


• 38 


Creeping of 


26 


Dimensions of . 


89 


Finish of . 


21 


Installing .... 


28 


Jewels for .... 


26 


Lamp Ratings of 


76 


Magnet's of 


73 


Xame-Plate Stamping . 


38 


Non-Creeping Device for 


26 


Orders for 


21 


Pivots for ... 


26 


Registers of 


34 


Ratio of Gears . 


48 


Speeds of . 


50 


Testing of 


32 


Weights of 


SO 


Horse-Power Ratings, Meter 


76, 77 


Illustrations 

Arc Meters . 


8, 9 


Clock for Two- Rate Meters 


10 


D-2 Meter . 


3 


GG-4 Meter . 


5 


High Torque Induction 




Meter .... 


12, 13 


J-2 Meter .... 


2 


Meter Covers . . . . 


20 


Meter Dials . . . . 


37 


Polyphase Round Pattern 




Meter 


17 



Page 
Polyphase Rectangular Pat- 
tern Meter ... 14, 15 



Prepayment Meter Device 
Single-Phase Round Pattern 

Meter 

Street Car or Railway Meter 
Switchboard Meter, No. 5 

Finish 

Interpretation of Orders 
Instructions for Installing Shunt 
Field Coils . . . . 
Instructions for Installing Meters 
Instructions for Installing Arma- 
tures 

Instruments, Meter Testing . 
Induction Meters 
Polyphase Meters (see poly- 
phase) 
High Torque Meters (see high 

torque) 
Single-Phase C-4 and Round 
Pattern 
Connections of 
Constants of 
Comparative Speeds of 
Creeping of 
Dimensions of 
Finish of . 
Installing . 
Jewels for . 
Lamp Ratings of 
Magnets of 

Name-Plate Stamping of 
Non-Creeping Device for 
Orders for . 
Pivots for . 
Registers of 
Ratio of Gears 
Speeds of . 
Weights of 
Jewels, Meter . 
J-l, J-2 Meters, See data on D-l 

D-2 Meters 
Kilowatt Rating Meter . 
Labels, Armature . 



11 



16 
3, 7 



4 

21 



22 



53 
32 



142 
47 

50 
26 
8S 
21 
28 
26 
76- 
71 
38 

2a 

21 
26 
34 
47 
50 
80 
26 



54r 



215 





Page 




Page 


"Meters— (Continued) 




Meters— (Continued) 




Lamp, Rating Meter 


76 


Reverse Rotation of 


31 


Letters, Meter Form 


18 


Shunt Field Coils for . 22 and 58 


Light Load Adjustments, Meter 


25 


Studs of 


79 


Location of Meters . 


28 


Speeds of 


50 


Load, Meter Testing 


32 


Testing of .... 


32 


Loss, Meter Watt . 


65 


Weights of . . . . 


80 


Monocyclic Meter (see polyphase) 




Watt Loss in . . . 


65 


Meters 




Watt Loss, Potential Circuit 


65 


Adjustable Shunt Field Coils 




Name-Plate, Meter 


38 


for ... 22 and 58 


Non-Creeping Device, Meter 


26,30 


Armatures for . 


53 


Orders, Placing Meter . 


21 


Brushes f or 


28 


Primary Meters 




Card Resistance for 


63 


Single-Phase Induction 




Creeping of 


26, 30 


Connections of 


142 


Comparative Speeds of . 


50 


Constants for . 


47 


Covers for .... 


19 


Creeping of 


26 


Commutators of 


28 


Dimensions of . 


88 


Calibration of . 


38 


Finish of . 


21 


Constants of . 


39 


Horse-Power Rating of . 


76 


Connections of . 


140 


Lamp Rating of 


76 


Capacities of . 


76,77 


Magnets for 


71 


Checking of 


32 


Orders for . 


21 


Dimensions of . 


82 


Registers for 


34 


Dials of . . 


37 


Speeds of . 


50 


Envelopes for Resistance of 


25 


Testing of . 


32 


Finish of ... . 


. 19 


Primary Meters 




Form Letters of 


. 18 


Polyphase Induction 




General notes on 


31 


Connections of ; 


144 


Horse-Power Ratings of 


76 


Constants for . 


49 


Instruments for Testing 


32 


Creeping of 


26 


Installing .... 


28 


Dimensions of . 


90 


Jewels for .... 


26 


Finish of . . . . 


21 


Kilowatt Ratings of 


77 


Form Letters . 


18 


Load for Testing 


32 


Horse-Power Rating of . 


77 


Lamp Ratings of 


•76 


Kilowatt Rating of . 


77 


Light Load Adjustments for 


25 


Magnets for 


74 


Magnets for 


. 68 


Orders for . 


21 


Non-Creeping Device for 


26,30 


Registers for . 


34 


Name-Plate Stamping of 


38 


Speeds of . 


50 


Orders for .... 


. 21 


Testing of . 


32 


Pivots for .... 


26 


Primary Meters 




Resistance of . 


63 


Thomson Recording Wattmetei 




Registers of 


. 34 


Connections for 


140 


Record Book for 


35 


Constants for . 


43 



316 





Page 


Page 


Meters — (Concluded) 




Orders for 


21 


Creeping of 


. 30 


Pivots for 


26 


Dimensions of . 


. 86 


Registers for .... 


34 


Finish of . 


. 19 


Testing of .... 


32 


Magnets for 


. 70 


Reading, Meter .... 


34 


Orders for . . . 


• . -1 


Register 




Register f or 


. 34 


Meter . . . 


34 


Speeds of . 


. 51 


Cyclometer .... 


22 


Prepayment Meter 




Remarks 




Connection for . 


. 141 


General 


31 


Dimension for . 


. 87 


Ordering . ... 


21 


Orders for .... 


. 21 


Resistance, Card and Tube . 


63 


Preface 


. 18 


Resistance, Total .... 


65 


Pivots, Meter .... 


. 26 


R. P.M. Meter 


50 


Potential Circuit Resistance a 


nd 


Reverse Rotation of Meter . 


31 


Watt Loss of Meter 


. 65 


Screws, Meter Jewel 


26 


Polyphase Meters 




Shunt Field Coils, Connections . 


24 


Connections for . . 


. 144 


Shunt Field Coils, Data on . 


58 


Constants for . 


. 49 


Shunt Field Coils, Installing 


22 


Creeping of 


. 26 


Speeds, Meter 


50 


Dimensions for 


. 90 


Standard, Meter (see instruments) 




Finish of . . . 


. 21 


Strength, Magnet .... 


68 


Horse-Power Rating of . 


77 


Stop Watches 


33 


Kilowatt Rating of . 


77 


Studs, Meter 


79 


Magnets for 


. 74 


Testing Meter 


32 


Register for 


. 34 


Testing, Meter Brush . 


28 


Speeds of . 


. 50 


Testing Rack 


32 


Testing of . 


. 32 


Three-Phase Meter (see polyphase 




Weights .... 


. 80 


Three-Wire Meter 




Ratio, Gear .... 


. 49 


Connections of . 


140 


Rating, Meter H.P., Kw. a 


nd 


Dimensions of . 


82 


Lamp .... 


. 76 


Two-Phase Meter (see polyphase) 




Railway Meter 




Two-Rate Meter 




Calibration 


. 38 


Connections for 


141 


Connections for 


. 141 


Dimensions for 


87 


Constants for . 


. 44 


Two-Wire Meter 




Dimension for . 


. 87 


Connections of ... 


140 


Finish of ... . 


. 21 


Dimensions of . 


82 


Jewels for . 


. 26 


Tube Resistance .... 


63 


Magnets for 


. 70 


Wattmeters (see meters) 




Xame-Plate Stamping of 


. 38 


Watches, Stop .... 


33 



217 



OCT 17 1903 



